APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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