1. Rajghatta C. Obama White House embraces yoga amid conservative contortions [White House “Yoga Garden For Easter”] [press release]. 2013. http://www.freerepublic.com/focus/news/3002743/posts?page=33
2. Patañjali. Patanjali Yoga Sutras. In: Aranya-Hariharananda, Mukerji PN, Vyasa, editors. Yoga philosophy of Patañjali : containing his yoga aphorisms with Vyasa’s commentary in Sanskrit and a translation with annotations including many suggestions for the practice of yoga. Albany: State University of New York Press; 1983. pp. xix, 483 p.
3. Katha Upanishad. In: Nikhilananda S, editor. The upanishads. Kolkata: Advaita Ashrama; 2008.
4. Kauśika AO. Śrīmad Bhagavadgītā. 5th rev. ed. New Delhi: Star Publications; 2000. p. 444.
5. Svatmarama. Hathapradipika: light on the teachings of hatha yoga. The original 13th century classical work on hatha. In: Digambarji S, editor. Kaivalyadhama; 1983.