Gaya APA

Swanson, C, P., Broughton, R, S. (1991). Parapsychology the controversial science . New York: New York: Ballavtine; 1991.

Gaya MLA

Swanson, Carl, P.., Broughton, Richard, S.. "Parapsychology the controversial science". New York: New York: Ballavtine; 1991, 1991. Text.