↑Radhakrishnan and Moore (1967, Reprinted 1989), A Source Book in Indian Philosophy, Princeton University Press, ISBN978-0691019581, pages 37-39, 401-403, 498-503
↑Nicholas Gier (2000), Spiritual Titanism: Indian, Chinese, and Western Perspectives, State University of New York Press, ISBN978-0791445280, pages 59-76
↑Jeaneane D Fowler (2012), The Bhagavad Gita, Sussex Academic Press, ISBN978-1845193461, pages 253-262
↑Renou 1964, p. 55 harvnb error: no target: CITEREFRenou1964 (help)
↑Mike Burley (2012), Classical Samkhya and Yoga - An Indian Metaphysics of Experience, Routledge, ISBN978-0415648875, page 39-41; Lloyd Pflueger, Person Purity and Power in Yogasutra, in Theory and Practice of Yoga (Editor: Knut Jacobsen), Motilal Banarsidass, ISBN978-8120832329, pages 38-39; Kovoor T. Behanan (2002), Yoga: Its Scientific Basis, Dover, ISBN978-0486417929, pages 56-58