1. Kuvalayananda S., Pranayama in general, Pranayama, ninth edition, 34, (2000).
2. Yogendra S., Breathing Exercise, Yoga of Physical Education, The Yoga Institution, Sant Curuz, 156, (1996).
3. Art Of Living, Sri Sri Ravi Shankar, http://www.artofliving.org/yoga/breathing-techniques/yoga-and-pranayama
4. Yoga Vidya Gurukul University, Nasik, http://www.yogapoint.com/info/pranayama.htm
5. Pal G.K., Velkumary S. and Madanmohan, Effect of short term practice of breathing exercises on autonomic functions in human volunteers. Indian J Med Res, 20 (9), 117- 120, (2004).
6. Mohan S.M., Svara (Nostril dominance) and bilateral volar GSR, Indian J Physiol Pharmacol. 40(14), 58-62, (1996).
7. Telles S., Nagaratna R. and Nagendra H.R., Breathing through a particular nostril can alter metabolism and autonomic activities, Indian J Physiol Pharmacol, 7 (4), 34-37, (1994).