editors, Linda A. Henkel, John Palmer
The Scarecrow Press, Inc., 1990
Buku Teks
edited by Jane Henry
Routledge, 2005
Buku Teks
edited by J. Gordon Melton
Gale Group, 2001
Buku Referensi
Bentine, Michael
Granada , 1981
Buku Teks
Karolyi, George, author
The Paranormal Phenomena Research Foundation, 2009
Buku Teks