Brooks, Fowler D., author
Houghton Mifflin, 1929
Buku Teks
Bentine, Michael
Granada , 1981
Buku Teks
Karolyi, George, author
The Paranormal Phenomena Research Foundation, 2009
Buku Teks
editors, Linda A. Henkel, John Palmer
The Scarecrow Press, Inc., 1990
Buku Teks
edited by Jane Henry
Routledge, 2005
Buku Teks