Rampa, T. Lobsang. 1966. You forever. New York: Pageant Press.
Smith, Suzy. 1965. The enigma of out-of-body travel. New York: Signet.
Smith, Suzy. 1968. Out-of-body experiences for the millions. Los Angeles: Sherboume Press.
YRAM (Marcel Louis Forhan). 1972. Practical astral projection. New York: Samuel Weiser. World Wide Web References
Robert Bruce's Home Pages (The Astral Pulse) —
http://www.geocites.com/Athens/Troy/9959/
Dr. Duncan MacDougal's Home Page —
http://www.artbell.com/duncan.html
Twin Shaman Home Page —