APA (7th ed.) Citation

Keene. (1932). Nancy's mysterious letter. Grosset and Dunlap.

Chicago Style (17th ed.) Citation

Keene. Nancy's Mysterious Letter. New York: Grosset and Dunlap, 1932.

MLA (8th ed.) Citation

Keene. Nancy's Mysterious Letter. Grosset and Dunlap, 1932.

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