APA (7th ed.) Citation

Gardner, E. S. (1947). The clue of the forgotten murder. Pocket Books.

Chicago Style (17th ed.) Citation

Gardner, Erle Stanley. The Clue of the Forgotten Murder. Nueva York: Pocket Books, 1947.

MLA (9th ed.) Citation

Gardner, Erle Stanley. The Clue of the Forgotten Murder. Pocket Books, 1947.