APA (7th ed.) Citation

Keene. (1944). The secret in the old attic. Grosset and Dunlap.

Chicago Style (17th ed.) Citation

Keene. The Secret in the Old Attic. New York: Grosset and Dunlap, 1944.

MLA (8th ed.) Citation

Keene. The Secret in the Old Attic. Grosset and Dunlap, 1944.

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