APA (7th ed.) Citation

St. Clair, O. (1957). A key to Ricardo. Kelley and Millman.

Chicago Style (17th ed.) Citation

St. Clair, Oswald. A Key to Ricardo. New York: Kelley and Millman, 1957.

MLA (9th ed.) Citation

St. Clair, Oswald. A Key to Ricardo. Kelley and Millman, 1957.