APA (7th ed.) Citation

Gardner, E. S. (1955). The case of the musical cow. Pocket Books.

Chicago Style (17th ed.) Citation

Gardner, Erle Stanley. The Case of the Musical Cow. Nueva York: Pocket Books, 1955.

MLA (9th ed.) Citation

Gardner, Erle Stanley. The Case of the Musical Cow. Pocket Books, 1955.