Parapsychology: research on exceptional experiences
edited by Jane Henry
Routledge, 2005
 Buku Teks SO
Encyclopedia of occultism & parapsychology
edited by J. Gordon Melton
Gale Group, 2001
 Buku Referensi
Bentine, Michael
The door marked summer
Granada , 1981
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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
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