Battersby, H.F. Prevost. 1961. Man outside himself. New Hyde Park, N.Y.: University Books.

Crookall, Robert. 1974. Astral projection: A record of out of the body experiences. London: Carol Publishing Group.

Crookall, Robert. 1972. Case-book of astral projection. Secaucus, N.J.: University Books.

Fortune, Dion. 1988. Psychic self-defence. Wellingborough, England: The Aquarian Press.

Fox, Oliver (Hugh Callaway). 1962. Astral projection. Secaucus, N.J.: The Citadel Press.

Fox, Oliver (Hugh Callaway). 1920. The pineal doorway. The Occult Review 31 (April).

Johari, Harish. 1987. Chakras: Energy centers of transformation. Rochester, Vermont: Destiny Books.

LaBerge, Stephen. 1985. Lucid dreaming. New York: Ballantine.

MacDougall, Duncan, M.D. 1907. Soul Substance. American Medicine Vol. #8, (April), . Submitted by W.E. Fair, and transcribed by Marie Juba and Karen Day. Page last updated Feb. 19, 1999.

Muldoon, Sylvan. 1936. The case for astral projection. Chicago: The Aries Press.

Muldoon, Sylvan J., and Hereward Carrington. 1968. The projection of the astral body. London: Rider.

Powell, Arthur Edward. 1927. The astral body. Wheaton, Ill.: Theosophical Publishing House.

Powell, Arthur Edward. 1927. The etheric double. Wheaton, Ill.: Theosophical Publishing House.

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.