Cita APA (7a ed.)

Reader's Digest Association. (1996). Great mysteries of the 20th century. Reader's Digest.

Cita Chicago Style (17a ed.)

Reader's Digest Association. Great Mysteries of the 20th Century. Pleasantville: Reader's Digest, 1996.

Cita MLA (9a ed.)

Reader's Digest Association. Great Mysteries of the 20th Century. Reader's Digest, 1996.