There are some classic books on the practice of pranayama, the theory and philosophy of the subtle, vital pranic force and Swami Satchidananda’s “Breath of Life” CD series that includes a guided pranic healing visualization.
1. Light on Pranayama by BKS Iyengar
2. Science of Breath by Swami Rama, Rudolph Ballentine MD and Alan Hymes
3. The Yoga of Breath: A Step-by-Step Guide to Pranayama by Richard Rosen
4. The Breath of Life (booklet): Integral Yoga Pranayama by Swami Satchidananda
5. Breath of Life CD: Integral Yoga Pranayama taught by Swami Satchidananda
6. El Aliento de Vida (Breath of Life –Spanish edition) Integral Yoga Pranayama by Swami Satchidananda