APA (7th ed.) Citation

Biggers, E. D. (1940). The house without a key. Pocket Books.

Chicago Style (17th ed.) Citation

Biggers, Earl Derr. The House Without a Key. Nueva York: Pocket Books, 1940.

MLA (9th ed.) Citation

Biggers, Earl Derr. The House Without a Key. Pocket Books, 1940.