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“Integral Psychology : Conciousness, Spirit, Psychology, Therapy“ by Ken Wilber. Shambhala, Boston and London. 2000.
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“Psychology of the Future“ by Stanislov Grof, MD. SUNY, Albany, NY. 2000.
“Essential Spirituality : The 7 Central Practices to Awaken Heart and Mind“ by Roger Walsh, MD, PhD. John Wiley & Sons, Inc, NY. 1999.
“Paths Beyond Ego : The Transpersonal Vision“ by Francis Vaughn and Roger Walsh, MD, PhD. Tarcher/Putnam, NY. 1993
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“The Varieties of Religious Experience“ by William James. New American Library, NY. 1958.