Epstein, Ron; Society, Buddhist Text Translation (June 2009). "The Shurangama Sutra Volume Seven"(PDF). Professor Ron Epstein's Online Educational Resources. pp. 197–207. Retrieved 2023-05-06.
(圖仙人之形,體生毛,臂變為翼,行於雲,則年增矣,千歲不死。)("In representing the bodies of [xian] one gives them a plumage, and their arms are changed into wings with which they poise in the clouds. This means an extension of their lifetime. They are believed not to die for a thousand years. ")Lunheng; "vol. 7" "chapter 27"p. 27 of 118
Cleary, Thomas F. (1998). The Essential Tao: An Initiation Into the Heart of Taoism Through the Authentic Tao Te Ching and the Inner Teachings of Chuang-Tzu. Edison, New Jersey: Castle Books. pp. 123–124. ISBN0-7858-0905-8. OCLC39243466.