More in depth explanation of Ashtanga Yoga Method and History 

Ashtanga Yoga - Kino MacGregor 

Ashtanga Yoga - Tim Miller 

Ashtanga Yoga - David Swenson 

Ashtanga Yoga - Richard Freeman 

The Sri K. Pattabhi Jois Ashtanga Yoga Research Institute

The Ashtanga Yoga Confluence 

Ashtanga Yoga Information 

Vanity Fair Article on Ashtanga Yoga