Journey By Heart: A Christology of Erotic Power

by Rita Nakashima Brock; Wipf & Stock Pub (November 17, 2008)

In Search of Maturity: An Inquiry into Psychology, Religion, and Self-Education

by Fritz Künkel; C. Scribner’s Sons; First Edition edition (1943)

Fear and Trembling and Sickness Unto Death

by Soren Kierkegaard, tr. by Walter Lowrie; Princeton University Press; With a New introduction by Gordon Marino edition (April 28, 2013)

Companions of the Inner Way: The Art of Spiritual Guidance

by Morton T. Kelsey; Crossroad; 2nd edition (August 1, 1995)

Grace Unfolding: Psychotherapy in the Spirit of The Tao-te ching

by Greg Johanson & Ron Kurtz; Harmony; Reprint edition (February 1994)

Maps of the Mind: Charts and Concepts of the Mind and its Labyrinths

by Charles Hampden-Turner; Collier / Macmillan; 1st edition (March 1, 1982)

The New Religious Consciousness

by Charles Y. Glock & Robert N. Bellah: University of California Press (1976)