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Beer, Robert (1999). The Encyclopedia of Tibetan Symbols and Motifs (Hardcover).  Shambhala.  ISBN 157062416X, ISBN 978-1570624162

Claudia Müller-Ebeling, Claudia and Christian Rätsch and Surendra Bahadur Shahi (2002). Shamanism and Tantra in the Himalayas. Transl. by Annabel Lee. Rochester, Vt.: Inner Traditions.

Maehle, Gregor (2007). Ashtanga Yoga: Practice and Philosophy (Paperback).  New World Library. ISBN 1577316061 & ISBN 978-1577316060

Norbu, Chögyal Namkhai (1999). The Crystal and The Way of Light: Sutra, Tantra and Dzogchen. Snow Lion Publications. ISBN 1-55939-135-9