Hatha Yoga Pradipika
The Hatha Yoga Pradipika (Light on Yoga) is a Sanskrit text compiled by Maharishi Swatmarama that elucidates the entire science of Hatha Yoga, including the areas of asana, pranayama, shatkarma, mudra, and bandha. It addresses these practices not only in terms of health and fitness, but also for awakening the vital energies of the pranas, the chakras, and kundalini shakti. It describes how Hatha Yoga is not simply a physical practice, but a process of cellular transmutation from gross to subtle to divine, positioning Hatha Yoga as the foundation practice for the higher yogas. 
- Swami Muktibodhananda Saraswati (Tr.) (1985). Hatha Yoga Pradipika. New Delhi:Thomson Press Ltd.