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2. B.K.S Iyengar, “Light on yoga”Harper Collins Publishers. London.
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5. Swami Satyanada Saraswati, “A systematic Course in the Ancient Tantric
Techniques of Yoga and Kriya” Publication Trust, Munger, Bihar school of yoga.
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8. Dr. Asana Andiappan, (2004), “Thirumoolar’s Astanga Yoga” published by Ms.Mary M.Y. Lalu, director endeavour press ltd. Hong Kong. (pp 156)
9. Swami satyanada saraswati, (1976) “Yoga Nidra” first printed by yoga publications trust, Munger, Bihar, India. P 1.