Hatha Yoga Pradipika, Original Sanskrit by Svatmarama, English Translation by Brian Dana Akers
Yoga Mala, Sri K. Pattabhi Jois
The Yoga-Sutra of Patanjali, Chip Hartranft
Ashtanga Yoga: The Practice Manual, David Swenson
Ashtanga Yoga: Practice & Philosophy, Gregor Maehle
Ashtanga Yoga As It Is, Matthew Sweeney
Light on Yoga, BKS Iyengar

Yoga Journal – www.yogajournal.com
Shri K. Pattabhi Jois Ashtanga Yoga Institute (formerly Ashtanga Yoga Research Institute) - www.kpjayi.org
Ashtanga Yoga – www.ashtanga.com