The History of Yoga

https://en.wikipedia.org/wiki/Yoga
http://abc-of-yoga.com/beginnersguide/yogahistory.asp
http://www.yogabasics.com/learn/history-of-yoga/
http://www.yogajournal.com/article/beginners/the-roots-of-yoga/
http://www.yogaweb.com/yoga/essentials/history.asp
http://www.indovacations.net/english/yoga_history.htm
http://www.yogalearningcenter.com/articles/short_history_of_yoga
https://www.preceden.com/timelines/67066-important-moments-in-yoga-history
http://www.beginning-yoga.info/history-of-yoga.html
http://www.marylandyoga.com/history_of_yoga.htm
http://www.todayifoundout.com/index.php/2013/04/the-history-of-yoga/
http://www.huffingtonpost.com/dl-cade/21-killer-yoga-photos-tha_b_7683330.html

Video
http://www.bbc.co.uk/programmes/p02v2yt6