The following list started with books studied during my formal Teacher Training and has continued to grow over the years. The practice of yoga is not just physical, but mental as well. I would recommend any and all of these books for practioners looking for a deeper, intellectual practice.
Anodea, Judith. Wheels of Life: A User's Guide to the Chakra System, Llewellyn Publications, 1999.
Arrien, Angeles. The Four-Fold Way, San Francisco, Harper, 1993.
Avalon, Arthur, The Serpent Power, Madras: Ganesh & Co., 1913.
Bhole, M.V., Some Neuro-Physiological Correlates of Yogasanas, Yoga Mimamsa, v. LXIX, No. 1, pp 53-61, April 1977.
Cambell, Joseph. The Inner Reaches of Outer Space, New York, Harper and Row, 1986.
Cambell, Joseph. The Mythic Image, Princeton, Princeton University Press, 1974.
Chen, William C.C. Body Mechanics of Thai Chi Chuan, Paperback Junction, 1973.
Cope, Stephen. Yoga and the Quest for the True Self, Bantam Books, 1999.
Dowd, Irene. Taking Root to Fly, New York, 1998.
Eawaran, Eknath. The Bhagavad Gita for Daily Living Volume 1, The End of Sorrow, Berkeley, Niligri Press, 1975.
Epstein, Mark. Thoughts without a Thinker: Psychotherapy from a Buddhist Perspective, Jo Ann Miller (Editor), Perseus Publishing, 2004.
Feurerstein, Georg. The Shambala Guide to Yoga. Boston, Shambala, 1996.
Feurerstein, Georg. The Yoga Tradition. Prescott Arizona, Hohm Press, 1998.
Fleishman, Paul. Karma and Chaos, Seattle, Vipassana Research Publications, 1999.
Frawley, David. Ayurveda and the Mind, Twin Lakes, Wisconsin, Lotus Press, 1996.
Frawley, David. Yoga and Ayurveda, Twin Lakes, Wisconsin, Lotus Press, 1999.
Gawain, Shakti. Living in the Light: A Guide to Personal and Planetary Transformation, Laurel King (Editor), New World Library, 1998.
H.H. the Dalai Lama & Howard C. Cutler. The Art of Happiness, Riverhead Books, New York, 1998
Hoff, Benjamin. The Tao of Pooh, Penguin Trade Paperback, 1983.
Iyengar, B.K.S. Light on Yoga, New York, Schoken Books, 1966.
Iyengar, B.K.S. The Tree of Yoga, Boston, Shambala, 1989.
Iyengar, B.K.S. and Razazan. Yoga: The Path To Holistic Health, DK ADULT, 2001.
Kaminoff, Leslie. Yoga Anatomy, Human Kinetics Publishers; 1 edition, 2007.
Kapandaji, I.A. The Physiology of the Joints, Vol. One Upper Limb, Vol. Two, Trunk and Vertebral Column, Vol. Three Lower Limb, London, Churchill Livingstone, 1982.
Kapit, Wynn and Elson, Lawrence. The Anatomy Coloring Book, New York Harper Collins, 1993.
Khalsa, Shakta Kaur. Yoga for Women (Yoga for Living), DK Adult, 2002.
Lasater, Judith. Relax And Renew: Restful Yoga for Stressful Times. Rodmell Press, USA, 2000
Levine, Stephen. A Gradual Awakening, New York, Anchor Books, 1979.
Lysne, Robin Hereens. Sacred Living, Berkeley, Conari Press, 1997.
McAfee, John. The Secret of the Yamas : A Spiritual Guide to Yoga, Mcafee Pub, 2001.
Mccall, Timothy. Yoga as Medicine: The Yogic Prescription for Health and Healing, Bantam, 2007.
Olivelle, Patrick. Upanishads, New York, Oxford University press, 1996.
Pappas, Stephanie. Yoga Posture Adjustments and Assisting: An Insightful Guide for Yoga Teachers and Students, Trafford Publishing, 2006.
Ross, Steve. Happy Yoga: 7 Reasons Why There’s Nothing to Worry About, New York Harper Collins, 2003.
Svoboda, Robert. Aghora III, The Law of Karma, Albuquerque, Brotherhood of Life Publishing, 1997.
Svoboda, Robert. Woman and Ayurveda, 1997.
Swami Satyananda Saraswati. Asana, Pranayama, Mudra, Bandha, Bihar India, 1966.
Swami Satyananda Saraswati. Yoga Nidra, Bihar India, 1966.
Walsh, Roger. Essential Spirituality, New York, John Wiley and Sons, 1999.
Watts, Alan. Eastern Wisdom: What Is Zen?, What Is Tao? an Introduction to Meditation, MJF Books, 2000.