Cita APA

Bord, J. (1989). Unexplained mysteries of the 20th century. New York: McGraw-Hill.

Citación estilo Chicago

Bord, Janet. Unexplained Mysteries of the 20th Century. New York: McGraw-Hill, 1989.

Cita MLA

Bord, Janet. Unexplained Mysteries of the 20th Century. New York: McGraw-Hill, 1989.