Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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