Bentine, Michael
The door marked summer
Granada , 1981
 Buku Teks
Research in parapsychology 1989: abstracts and papers from the thirty-second annual convention of the Parapsychological Association, 1989
editors, Linda A. Henkel, John Palmer
The Scarecrow Press, Inc., 1990
 Buku Teks
Karolyi, George
An excursion into the paranormal
The Paranormal Phenomena Research Foundation, 2009
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Brooks, Fowler D.
The psychology of adolescence
Houghton Mifflin, 1929
 Buku Teks
Jacobs, Michael
Sigmund freud
Sage Publications, 2003
 Buku Teks