http://images.google.co.in/images?q=yoga&hl=en&um=1&ie=UTF-8&sa=X&oi=images&ct=title
http://en.wikipedia.org/wiki/Yoga
http://www.sivananda.org/
http://www.lifepositive.com/yoga.html
http://www.lifepositive.com/Body/yoga/ashtanga-yoga.asp
http://www.webindia123.com/yoga/yoga.htm
http://www.yoga.com/
http://www.a2zyoga.com/
http://www.kriya.org/
http://www.allaboutspirituality.org/history-of-yoga.htm
http://en.wikipedia.org/wiki/History_of_Yoga
http://www.yoga-central.net/The_history_of_Yoga.html
http://www.truthstar.com/yoga/typesofyoga.asp
http://chennaionline.com/health/Ayurveda/2007/05ayur07.asp
http://www.americanyogaassociation.org/general.html