Hatha Yoga: The Report of a Personnal Experience
by Theos Bernard
ISBN 0955241227

The Gheranda Samhita: A Treatise on Hatha Yoga
Sris Chandra Vasu
ISBN 1436690420

Raja Yoga
by Swami Vivekananda
ISBN 8180900363

Sacred Texts: The Yoga Sutras of Patanjali
by Swami Vivekananda
ISBN 1905857039

A Search in Secret India
by Paul Brunton
ISBN 1844130436

The Morning of the Magicians (Mysteries of the Universe)
by Louis Pauwels, Jacques Bergier
ISBN 0285635832

The Serpent Power: Secrets of Tantric and Shaktic Yoga
by Arthur Avalon
ISBN 0486230589

Tantrik Texts
by Arthur Avalon
ISBN 8177557254

Yoga: Immortality and Freedom (Works of Mircea Eliade)
Mircea Eliade
ISBN 0691017646

Tibet’s Great Yogi Milarepa
by W.Y. Evans-Wentz
ISBN 8178222523

The Gheranda Samhita: A Treatise on Hatha Yoga
by Sris Chandra Vasu
ISBN 1436690420

Links:
Raja Yoga wikipedia.org

The cobra breath is a tantric breathing exercise. In essence, it is an energy-building breath. One uses breath to move kundalini energy up from the root chakra, at the base of the spine, to the crown chakra which lies at the crown of the head.The particular form cobra breath outlined below is used to expand consciousness, and it can lead to states of bliss and joy. Moving kundalini energy through the body is also rejuvenating for organs and aiding cellular processes. Follow the steps below to experience the cobra breath.

Instructions

1. Sit on the edge of a chair, with the edge your buttocks resting on the seat. You may put your hands on your knees if desired.You can also sit with your back against the wall and use a pillow to support your lower back.

2. Press your tongue on the roof of your mouth. Squeeze your anal muscles, or perineum, and hold.

3. Breathe in. As you breathe in, first feel the energy come up from the base of your spine and up your spine. It should progress to the back of your head and around the top to the crown of your head. Keep your tongue pressed on the roof of the mouth, and make sure your anal muscles stay contracted.

4. As you breathe out, keep your tongue on the roof of your mouth.

5. Slowly, breathe out and make a hissing noise like a snake. Your facial muscles around your jaw and lips should be contracted, almost as if you are smiling, when breathing out.

Reference:How to Do the Cobra Breathing Exercise ehow.com

Links:
Ujjayi breath wikipedia.org