APA (7th ed.) Citation

Cain, J. M. (1934). The postman always rings twice. Triangle Books.

Chicago Style (17th ed.) Citation

Cain, James M. The Postman Always Rings Twice. New York: Triangle Books, 1934.

MLA (9th ed.) Citation

Cain, James M. The Postman Always Rings Twice. Triangle Books, 1934.