Reader's Digest Association. (1996). Great mysteries of the 20th century. Reader's Digest.
Citación estilo ChicagoReader's Digest Association. Great Mysteries of the 20th Century. Pleasantville: Reader's Digest, 1996.
Cita MLAReader's Digest Association. Great Mysteries of the 20th Century. Reader's Digest, 1996.
Warning: These citations may not always be 100% accurate.