APA-referens (7:e uppl.)

Keene, C. (1981). The clue in the crossword cipher. Armada books.

Chicago-referens (17:e uppl.)

Keene, Carolyn. The Clue in the Crossword Cipher. New York: Armada books, 1981.

MLA-referens (9:e uppl.)

Keene, Carolyn. The Clue in the Crossword Cipher. Armada books, 1981.