by Colin Wilson
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St. Clair, David. Drum and Candle. London: Macdonald, 1971.
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Thurston, Herbert. Ghosts and Poltergeists. London: Burns Oates and Washbourne, Ltd., 1953.
Tyrrell, G. N. M. Science and Psychical Phenomena. Apparitions. New York: University Books, 1961.
Wickland, Carl A. Thirty Years Among The Dead. Los Angeles: National Psychological Institute, 1924.
Wilson, Colin. The Occult. London: Hodder & Stoughton, 1971.
———. Mysteries: An Investigation into the Occult, the Paranormal, and the Supernatural. London: Hodder & Stoughton, 1978.
Wolman, Benjamin B., ed. Handbook of Parapsychology. New York: Van Nostrand Reinhold, 1977.