Story Idea: The Ape Immortals – The Origin of Sun Wukong

The following story sketch was originally posted on my external blog on the Historum website. The site recently switched to a new server but the blogs have yet to be migrated. I’m posting it here for posterity. Regular articles will resume after this entry.

As a lover of Chinese mythology and a former primatology major, I’ve always wanted to create my own primate-based character similar to Sun Wukong. I originally wanted him to be the son of Monkey or the son of one of his advisers or allies during his days as a demon. Either way, I thought he could train under Sun and gain similar powers. But then I decided that I wanted him to be a more civilized, yet more powerful version of the character; someone who is held in high regard by all beings of the six realms (demons, hungry ghosts, animals, humans, asuras, and devas) of Buddhist cosmology, as well as the Buddha himself. After reading about the ancient Chinese view of the gibbon, [1] a small, long-armed, arboreal ape native to Asia (fig. 1), I thought the character could be an ape immortal. It was only recently that I decided to pair him with a female since gibbons generally mate for life.

gibbon-jump-sachin-rai

Fig. 1 – A gibbon soaring through the treetops. Photo by Sachin Rai. A larger version can be found here.

A rough sketch of the story is presented below. The tale is meant to be a standalone story, but it includes details that explain the origin of Monkey and how his life parallels his spiritual parentage. I’ve drawn upon traditional Chinese religious and vernacular texts for inspiration. The notes contain important information on the texts I used and why particular plot choices were made.

I. The Story

The Dao (道, the way) gives birth to the One (yiqi, 一氣, the first breath);
The One gives birth to the Two (yin and yang, 陰陽);
The Two gives birth to the Three (San qing, 三清, the Three Pure Ones);
The Three gives birth to the Ten Thousand Things.
The Ten Thousand Things carry the Yin and enfold the Yang;
Kneading gently, they create harmony. [2]

In the beginning of the universe, the Three Pure Ones, the manifestations of the Dao, use the vital energies of the cosmos to create heaven, earth, and all living things. Among the first to be created are two gibbons, a male and a female (fig. 2). They become the progenitors of all apes and monkeys, just like the phoenix and his mate, the next to be created, are the progenitors of all birds. Being embodiments of yin and yang sexual forces, the pair propagates quickly. They frolic with their children and the following generations through the mountain tops soaking up qi (氣), prolonging their lives for thousands upon thousands of years. And Like modern apes, the pair shows a propensity for observation, watching the cyclical movement of the stars and planets and becoming aware of the ebb and flow of qi, studying the energy and cultivating its mysteries over endless eons.

Mated Gibbons

Fig. 2 – A pair of mated gibbons. A larger version can be found here.

Once their family grows to titanic proportions, the gibbons wield their arcane knowledge to create an island home, raising up Flower-Fruit Mountain (Huaguo shan, 花果山) from the ocean. There, they construct the Water Curtain Cave (Shuilian dong, 水簾洞) from which they continue to plumb the depths of the Dao. [3] Their exploration takes them to the heights of the mountain where heaven meets earth, using the corresponding yin (earth/female) and yang (heaven/male) energy to fuel their reenactment of the creation of the cosmos through sexual union. By chance, these powerful, creative sexual energies are absorbed by a boulder atop the mountain. [4]

As mated gibbons often do, the pair sings the most beautiful duets that echo throughout time and space. [5] The power of their song continues to increase as their immortal lives extend through the ages. It becomes so powerful that the duet is capable of crumbling mountains, churning the oceans, and shaking the very firmament of heaven. In fact, their song inadvertently topples one of the mountain pillars supporting the sky, and so the devi Nuwa (女媧) is forced to mend the heavens with five magic stones. [6] The primordial devas and spirits fear what might happen if the couple continues, so they plead with the gibbons to separate in order to avoid destroying the cosmos. They promise to allow the pair to see one another at some fixed period of time in the distant future.

The immortal lovers reluctantly agree and isolate themselves to two separate holy mountains; [7] the male becomes known as the “Eastern Ape Immortal” (東猿仙) and the “Ape Patriarch” (Yuan jiazhang, 猿家長), while the female becomes known as the “Western Ape Immortal” (Xi yuan xian, 西猿仙) and the “Ape Matriarch” (Yuan nu jiazhang, 猿女家長). The two are much sought after by animal, human, devil, and deva to teach them the essence of the Dao. Both become the religious teachers of countless beings, from the lowliest creature to the purest deva in the highest heaven. Former students include the Tathagata Buddha and the immortal Subhuti. [8]

The primordial devas are eventually superseded by deified humans after a great battle between the Shang and Zhou Dynasties. [9] The newly appointed August Jade Emperor (Yuhuang dadi, 玉皇大帝) and the rest of the heavenly retinue go about setting the cosmos into order. The promise made by the primordial devas is lost to time.

It is during the interim when the previously mentioned boulder, having been nourished by the light of the sun and moon for centuries, births a stone embryo that is eroded by the elements into a stone monkey. He becomes the king of the monkeys on Flower-Fruit Mountain by rediscovering the Water Curtain Cave that the previous generations of his kin had forgotten long after the Ape Immortals went into exile. The monkey eventually trains under Subhuti, receiving the religious name Sun Wukong (孫悟空, Monkey Awakened to Vacuity) (fig. 3), and achieving great magical powers with which he later uses to rebel against heaven for not recognizing him as a full-fledged god. After being imprisoned by the Buddha for 500 years, Sun redeems himself by escorting the monk Tripitaka (Sanzang, 三藏) to India, and for this he is rewarded with Buddhahood, becoming the “Victorious Fighting Buddha” (Dou zhansheng fo, 鬥戰勝佛).

n8mflz

Fig. 3 – A modern depiction of Sun Wukong (larger version). A photomanipulation by the author.

After the fixed period of time has elapsed, the primordial gibbons request to leave their individual exile. The August Jade Emperor, however, refuses due to the potential for danger. Angered because heaven went back on its word, the immortal lovers leave their exile anyway, and so all of the devas, spirits, and devils struggle to keep them apart. This is an impossible task given that the two are among the highest immortals. A great battle ensues in which the pair uses their knowledge of the Dao to put the celestial army into disarray. For instance, the Ape Patriarch is a master of transformations; he grows to titanic proportions, multiplies his long arms, and captures the most powerful Daoist and Buddhist deities in his vice-like hands. The Ape Matriarch is a mistress of illusions; she clouds the minds of the soldiers, making them think they are fighting her when they are really fighting each other. [10] In addition, their individual songs have grown in power, now capable of destroying anything by separating the yin and yang forces therein (fig. 4).

Gibbon yawning

Fig. 4 – A gibbon yawning. Imagine powerful sound waves emanating from its mouth. A larger version can be found here.

The August Jade Emperor begs the Buddha to intervene like he had done for the rebelling Sun Wukong in the past. But considering that heaven went back on its word and the ape immortals are both friends and former teachers of the Enlightened One, the Tathagata sends their spiritual son, the Victorious Fighting Buddha, to ask them to pacify their rage instead of using trickery to halt the onslaught. [11] After a brief reunion, the pair acquiesces, and all three travel by cloud to the Buddha’s abode on Vulture Peak (Lingjiu shan, 靈鷲山) to discuss the matter. The immortal lovers opine the great injustice done to them by the heavenly hierarchy. The Buddha knows their duet is part of their primordial animal nature and is the ultimate expression of their love, which reaches back to the very beginning of time. Unfortunately, he realizes that the power of their song could destroy the universe if allowed to take place.

After some thought, the Tathagata gives them a lesson on the cyclical dissolution of the cosmos: at the end of each Mahakalpa (Da jie, 大劫), the universe is destroyed by a different element. There are fifty-six destructions by fire, seven by water, and one by wind. The latter is the most powerful, destroying all earthly and heavenly realms below the pure realm inhabited by the Buddha and his retinue. The Tathagata then suggests a compromise in which the couple can remain as his permanent guests of the Buddha realm, where they can frolic with the Victorious Fighting Buddha. This way the gibbons will be free to sing their melodious song without fear of negative effects. And when the end of the sixty-fourth Mahakalpa comes to a close, their song will serve the function of the wind element to bring about the dissolution of the universe to make way for the new one. [12]

II. Background notes

1) The Chinese viewed the gibbon (Yuan, 猿) as symbolic of Confucian gentlemen and Daoist immortals. Their long arms were thought to be evidence of their expertise in soaking up qi. This resulted in long lives and occult powers (Geissmann, 2008).

2) This is based on chapter 42 of the Daodejing (道德經), the premiere holy text of Daoism. The original passage has been interpreted differently by different scholars. I’m using the interpretation presented in Laozi and Wilson, 2012, p. 197. The cited text, however, makes no mention of the Three Pure Ones. This is based on later Daoist texts and folk views on the supreme immortals. See Stevens, 1997, pp. 68-70.

3) JTTW never explains where the magical cave came from. This is my attempt to give it an origin story.

4) JTTW states the following about the boulder: “Since the creation of the world, it had been nourished for a long period by the seeds of Heaven and Earth and by the essences of the sun and moon, until, quickened by divine inspiration it became pregnant with a divine embryo” (Wu & Yu, 2012, p. 101). I’ve never been satisfied with the explanation for Monkey’s birth. Why would the rock produce a simian character? This is why I wrote that the Ape Immortals make love atop of the mountain, thereby impregnating the boulder with powerful, creative energies. In Daoist sexual practices, earth and heaven are often euphemisms for the feminine and masculine sexual energies of yin and yang (Wile, 1992, pp. 11-12 and 28-29). Therefore, what I have proposed is simply a difference in semantics.

5) Gibbon duets have an ethereal quality. Those wishing to listen to some can do so here and here (make sure your volume is not too high). It’s interesting to note that gibbons can naturally perform what takes professional opera singers years of dedicated practice to achieve (Lougheed, 2014).

6) The original mythology has the pillar being fallen by a water demon. I guess an explanation could be included somewhere that the original reason for the disaster, the gibbon song, was forgotten to time and confused with a different incident.

7) I wanted there to be a parallel between Monkey’s imprisonment and the pair’s exile, both of which are connected to mountains.

8) The Buddha’s tutelage under the gibbons happens in the distant past when he is still a Bodhisattva in the Tushita heaven. I listed Subhuti because I wanted there to be a further link between Monkey and the Ape Immortals. Therefore, the skills of Sun Wukong’s spiritual parents are transmitted to him by their former student.

9) This is based on the events in the 16th-century Chinese classic Fengshen Yanyi (封神演義), or Investiture of the Gods. In the story, chaos in heaven causes many gods to be reborn on earth as various heroes of the competing Shang and Zhou Dynasties. The King of Zhou wins the conflict and his strategist, an apprentice of the supreme immortal Yuanshi Tianzun (元始天尊), one of the Three Pure Ones, uses a magic list to deify the souls of those who died in battle. Thus, heaven is repopulated once more (Stevens, 1997, p. 60).

10) The strengths of each correspond to the skills passed on to the Buddha and the immortal Subhuti. Again, I wanted there to be a parallel between Monkey and his spiritual parents. The pair rebels like he did, but they do so because of injustice, not pride. However, I must say that lofty immortals would have surely evolved passed such earthly “wants and needs” (e.g. lust and anger). Daoist literature and vernacular Chinese fiction often describes immortals as being celibate. But the immortal love of the couple may transcend what might be expected of human-based immortals. That’s why I present them as living embodiments of yin and yang. Wile (1992) states: “The early [Daoist] texts are marked by the existential loneliness of yin and yang for each other, and their union consummates a cosmic synergy” (p. 29).

11) An example of trickery would be the way that the Buddha uses illusion to make Monkey think that he has left his palm in the seventh chapter of JTTW.

12) Buddhism recognizes a measurement of time called a Kalpa (jie, 劫), which can be many millions or even billions of years long depending on the tradition. Said traditions recognize between four and eighty kalpas (Robert & David, 2013, p. 409). The total of these respective ranges make up a Mahakalpa (dajie, 大劫), which is divided into four periods of nothingness, creation, subsistence, and finally destruction, each period being between one and twenty kalpas long (Robert & David, 2013, p. 496). For more information on the cyclical destruction of the universe by fire, water, and wind, see my article here.

Bibliography

Geissmann, T. (2008). Gibbon paintings in China, Japan, and Korea: Historical distribution, production rate and context. Gibbon Journal, 4, pp. 1-38. Received from http://www.gibbonconservation.org/07_publications/journal/gibbon_journal_4.pdf

Laozi, & Wilson, W. S. (2012). Tao te ching: An all-new translation. Boston & London: Shambhala

Lougheed, K. (2012, August 23). Helium reveals gibbon’s soprano skill. Retrieved January 20, 2014, from https://www.nature.com/news/helium-reveals-gibbon-s-soprano-skill-1.11257

Robert, E. B. J., & David, S. L. J. (2013). The Princeton Dictionary of Buddhism. Princeton, NJ: Princeton University Press.

Stevens, K. G. (1997). Chinese gods: the unseen world of spirits and demons. London: Collins & Brown.

Wile, D. (1992). Art of the bedchamber: The Chinese sexual yoga classics including women’s solo meditation texts. Albany: State University of New York Press.

Wu, C., & Yu, A. C. (2012). The journey to the West: Volume 1. Chicago, Illinois: University of Chicago Press.

Sun Wukong’s Strength-Bestowing Ritual

In chapter 88, the pilgrims arrive in the lower Indian prefecture of Jade Flower District (Yuhua xian, 玉華縣), which strikes Tripitaka as a spitting image of the Tang Chinese capital of Chang’an. There, the disciples’ monstrous appearance rouses the local ruler’s three sons to action, respectively wielding two staves and a battle rake against what they think are demons come to harm their father. However, they soon learn Monkey, Pigsy, and Sandy are celestial warriors possessing magical versions of their mere earthly arms. The three princes are later accepted as disciples, the oldest wanting to learn Monkey’s techniques and the second and third oldest wanting to learn from Pigsy and Sandy in turn. But when they fail to lift the monks’ celestial weapons, Monkey performs an arcane ritual in which he bestows each prince with superhuman strength and durability:

In a secluded room behind the Gauze-Drying Pavilion, Pilgrim traced out on the ground a diagram of the Big Dipper. Then he asked the three princes to prostrate themselves inside the diagram and, with eyes closed, exercise the utmost concentration. Behind them he himself recited in silence the true sayings of realized immortality and intoned the words of Dharani as he blew divine breaths into their visceral cavities. Their primordial spirits were thus restored to their original abodes. Then he transmitted secret oral formulas to them so that each of the princes received the strength of [ten] thousand arms. [1] He next helped them to circulate and build up the fire phases, as if they themselves were carrying out the technique for shedding the mortal embryo and changing the bones. Only when the circulation of the vital force had gone through all the circuits of their bodies (modeled on planetary movements) did the young princes regain consciousness. When they jumped to their feet and gave their own faces a wipe, they felt more energetic than ever. Each of them, in fact, had become so sturdy in his bones and so strong in his ligaments that the eldest prince could handle the golden-hooped rod, the second prince could wield the nine-pronged muckrake, and the third prince could lift the fiend-routing staff (Wu & Yu, 2012, pp. 202-203).

There is a lot of information to unpack, so I’ll go through the important parts line by line.

1. “Pilgrim traced out on the ground a diagram of the Big Dipper.”

The Big Dipper (gang dou, 罡斗), also known as the Northern Dipper (beidou, 北斗), is a pattern of seven stars associated with the constellation Ursa Major (fig. 1). Daoism considers the pole star of this pattern to be the center of the cosmos through which imminates “primordial breath” (generative qi), which has long been deified as the great god Taiyi. The constellation is associated with a Daoist ritual known as Bugang (步綱/罡, “Walking the Guideline”) in which a practitioner paces the Big Dipper pattern with their feet on the ground. This ritual dance is synonymous with the much older shamanistic Yubu (禹步, “Paces of Yu”) used by ancient Sage Kings to conquer primordial chaos by pacing the stars and planets into motion, thereby directing the seasons and passage of time. The ritual involved pacing an inwardly spiraling circular pattern while dragging one foot behind the other in imitation of the limp adopted by Yu the Great after over-exerting himself quelling the fabled World Flood (fig. 2). Later Daoists viewed Yubu as a means of gaining immortality because the limping, three pace-style walking pattern symbolized the practitioner spanning the three realms of Earth, Man, and finally Heaven (this has an interesting Vedic correlation). [2] But, most importantly, by the Tang and Song dynasties, bugang served the purpose of purifying the area before an altar, ensuring the liturgy to follow takes place in a consecrated space. In fact, some sources interchange the characters for Bugang with the homonyms 布剛, meaning “distributing strength”, which denotes the demonifugic properties of the dance (Andersen, 1989). Therefore, Monkey draws the Big Dipper talisman on the ground in order to create a sacred space free of any negative influences.

big dipper anf yu pace

Fig. 1 – The location of the Big Dipper in relation to the Ursa Major constellation (larger version). Originally from this Futurism article. Fig. 2 – A diagram showing the inwardly spiraling pattern of Yubu (top) and the dipper pattern of Bugang (bottom) (larger version). Take note of the spiral’s limping, three pace-style walking pattern. Originally found on this wordpress article.  

2. “Then he himself recited in silence the true sayings of realized immortality and intoned the words of Dharani…”

The “true sayings” (zhenyan, 真言) is the Chinese term for Mantra, meaning “spell” or “magical formula”. A mantra is “a syllable or series of syllables that may or may not have semantic meaning, most often in a form of Sanskrit, the contemplation or recitation of which is thought to be efficacious” (Robert & David, 2013, p. 529). The most famous mantra is of course Om Mani Padme Hum, the very same six-syllable prayer that was used to weigh down the mountain holding Monkey prisoner for rebelling against heaven.

The “true sayings” is often used as an abbreviation for Dharani (tuoluoni/zongchi, 陀羅尼/總持), a Sanskrit term meaning “mnemonic device” (fig. 3). Like mantras, dharani are comprised of syllables, but these instead serve to remind practitioners of broader concepts, for example a single syllable representing the first letter of a much longer phrase. There exists four types of dharani said to be used by Bodhisattvas to achieve enlightenment: 1) those used for teaching interpretations of Buddhist law; 2) those used for understanding the exact meaning of important words; 3) those used for casting spells; and 4) those used for spiritual endurance in the face of suffering (Robert & David, 2013, pp. 241-242). The third type, which concerns us, falls under a category of sutra recitation called Paritta (minghu/minghu jing, 明護/明護經), which is Pali for “protection”. The historical Buddha is known to have delivered paritta verses, including those for “protection from evil spirits, the assurance of good fortune, exorcism, curing serious illness, and even safe childbirth” (Robert & David, 2013, p. 630).

In both cases zhenyan/mantra and dharani refer to magical formulas of sorts and were no doubt chosen because they gave the ritual an heir of arcane authenticity. Additionally, I suggest the use of dharani may have also been chosen to denote a spell of protection, as in Sun wanted to protect the princes during the transformation of their bodies.

(Note 06-15-19: Feng Dajian of Nankai University notified me via Twitter that he disagrees with Anthony C. Yu’s 2012 revised translation (cited above) associating the “True Sayings” with the Buddhist Dharani. This is because he feels the ritual is overtly Daoist, noting that the religion also has its own True Sayings.)

Pratisara_Mantra1

Fig. 3 – A Dharani print from the late Tang Dynasty. Original from Wikicommons.

3. “…as he blew divine breaths into their visceral cavities. Their primordial spirits were thus restored to their original abodes.”

Journey to the West translator Anthony C. Yu notes this section “is an abbreviated or paraphrastic account, in fact, of the neidan (internal or physiological alchemy process)” (Wu & Yu, 2012, p. 396, n. 8). Monkey already went through this process in chapter two when he practiced a series of breathing and energy circulation exercises that resulted in his immortality. Therefore, he uses his own hardwon “divine breath” or “immortal energy” (xianqi, 仙氣) to fortify the princes’ bodies by drastically speeding up the years-long process of internal cultivation to only a matter of hours or minutes. Monkey’s breath bolsters their own energy, helping them to achieve “primordial spirits” (yuanshen, 元神), a term commonly associated with Buddhahood or enlightenment. In Daoism, the term is synonymous with the attainment of immortality via the formation of a “Sacred Embryo” (shengtai, 聖胎) (fig. 4), which is forged from spiritual energies over long years of self-cultivation (Darga, 2008).

baby belly

Fig. 4 – The Sacred Embryo is sometimes depicted as a baby (or in this case a Buddha) on a practitioner’s stomach (larger version). Found on this blog.

4. “He next helped them to circulate and build up the fire phases…”

The fire phases (huohou, 火候) comprise the process of circulating spiritual energy throughout the body at prescribed times (fig. 5). Monica Esposito (2008) writes there are three phases in total, making up two distinct periods of activity and rest:

The first is a phase of “yangization” in which Yang augments and Yin decreases. This is described as a warlike or martial period, corresponding to the advancement of a light called Martial Fire (wuhuo 武火) or Yang Fire (yanghuo 陽火) that purifies by burning and eliminates defiled elements to release the Original Yang and increase it. At the cosmic level, the beginning of this phase is symbolized by the winter solstice (zi 子) and by the hexagram fu 復 ䷗ (Return, no. 24), which indicates the return of Yang. This is followed by a phase of balance, a time of rest called muyu ([沐浴] ablutions). At the cosmic level, this phase is symbolized by the spring and autumn equinoxes and by the hexagrams dazhuang 大壯 ䷡ (Great Strength, no. 34) and guan 觀 ䷓ (Contemplation, no. 20). The third stage is a phase of “yinization” in which Yin augments and Yang decreases. This period, called Civil Fire (wenhuo 文火) or Yin Fire (yinfu 陰符), corresponds to a decrease of the light. The adept achieves the alchemical work spontaneously and without any effort or voluntary intervention; water descends to moisten, fertilize, and temper fire. At the cosmic level, this phase is symbolized by the summer solstice (wu 午) and by the hexagram gou 姤 ䷫ (Encounter, no. 44) (p. 531).

Mastering the complicated chronological rhythm of this process is considered the best kept secret of internal alchemy (Esposito, 2008). Therefore, Monkey navigates this temporal maze for the princes, ensuring the spiritual energy that he has helped them cultivate ebbs and flows when prescribed. Once again we see Sun has sped up a lengthy process to only a few hours or minutes.

Fire phases

Fig. 5 – A chart showing the fire phases, the 12 phases of the moon, and the corresponding hexagrams (larger version). From Kim, 2008, p. 528.

Conclusion

This fascinating strength-bestowing ritual draws on multiple aspects of Buddho-Daoist ceremony and internal alchemy. First, Sun chooses a secluded room where he traces a diagram of the Big Dipper on the floor in order to consecrate the space. Second, he recites magical spells likely intended to protect the princes during their bodily transformation. Third, Monkey uses his own divine breath to ignite their spiritual energy, manually fanning the flames to higher levels of spiritual attainment. Finally, he controls the ebb and flow of the resulting energy throughout their bodies according to a prescribed chronological rhythm. In all, Sun shortens a years-long process to only a few hours or minutes.

Despite the ritual’s relationship to internal cultivation and the attainment of immortality, the process only bestows the princes with new, adamantine bodies capable of superhuman strength. They in essence become the fantasy equivalent of today’s comic book superheroes. The princes gaining power from a divine being is similar to the concept of “Divine Empowerment” from DC Comics. A good example is Captain Marvel (fig. 6), a child-turned-adult who receives super strength (among other powers) from a battery of Western gods and sages through the medium of a divine wizard.

4139607-160

Fig. 6 – Billy Batson transforming into the superhero Captain Marvel, also known colloquially as Shazam (larger version). Originally found on this Comic Vine article.

Notes:

1) The original English translation says “a thousand arms”, but the Chinese says 萬千 (wanqian), which is a literary term for “tens of thousands” or “myriad”. Therefore, the translation has been corrected

2) Andersen (2008) notes the three paces are similar to those used by Vedic priests:

It would appear, in other words, that even in this early period the Paces of Yu constituted a close parallel to the three Strides Viṣṇu in early Vedic mythology, which are thought to have taken the god through the three levels of the cosmos (thereby establishing the universe), and which indeed, just like the Paces of Yu in Taoist ritual, are known to have been imitated by Vedic priests as they approached the altar—and in the same form as the Paces of Yu, that is, dragging one foot after the other (pp. 238-239).

Sources:

Andersen, P. (1989). The Practice of Bugang. Cahiers d’Extrême-Asie, 5. Numéro spécial Etudes taoïstes II / Special Issue on Taoist Studies II en l’honneur de Maxime Kaltenmark. pp. 15-53.

Andersen, P. (2008). Bugang In F. Pregadio (Ed.), The encyclopedia of Taoism: Volume 1 (pp. 237-240). London [u.a.: Routledge].

Darga, M. (2008). Shengtai In F. Pregadio (Ed.), The encyclopedia of Taoism: Volume 2 (pp. 883-884). London [u.a.: Routledge].

Esposito, M. (2008). Huohou: 2. Neidan In F. Pregadio (Ed.), The encyclopedia of Taoism: Volume 1 (pp. 530-532). London [u.a.: Routledge].

Kim, D. (2008). Houhou: 1. Waidan In F. Pregadio (Ed.), The encyclopedia of Taoism: Volume 1 (pp. 526-530). London [u.a.: Routledge].

Robert, E. B. J., & David, S. L. J. (2013). The Princeton Dictionary of Buddhism. Princeton University Press.