APA (7th ed.) Citation

Keene, C. (1967). The clue in the crossword cipher. Grosset & Dunlap.

Chicago Style (17th ed.) Citation

Keene, Carolyn. The Clue in the Crossword Cipher. New York: Grosset & Dunlap, 1967.

MLA (9th ed.) Citation

Keene, Carolyn. The Clue in the Crossword Cipher. Grosset & Dunlap, 1967.

Warning: These citations may not always be 100% accurate.