Transformation of Consciousness: Conventional and Contemplative Perspectives On Development

by Ken Wilber, Jack Engler, and Daniel P. Brown; Shambhala (September 12, 1986)

The Atman Project: A Transpersonal View of Human Development

by Ken Wilber; Quest Books (1996)

The Ego and the Dynamic Ground: A Transpersonal Theory of Human Development

by Michael Washburn; State University of New York Press (January 25, 1995)

Native North American Spirituality of the Eastern Woodlands: Sacred Myths, Dreams, Visions, Speeches, Healing Formulas, Rituals and Ceremonials

by Elizabeth Tooker; Paulist Press (1979)

Repair of the Soul: Metaphors of Transformation in Jewish Mysticism and Psychoanalysis

by Karen Starr; Outledge (June 11, 2008)

Mystical Christianity: A Psychological Commentary on the Gospel of John

by John A. Sanford; The Crossroad Publishing Company (February 1, 1994)

Dark Night of the Soul: A Classic in the Literature of Mysticism by St. John of the Cross

by Saint John of the Cross, E. Allison Peers (Editor, Translator); Image; Reprint edition (March 15, 2005)