APA (7th ed.) Citation

Lewis, C. (2001). The Screwtape letters: Screwtape proposes a toast. Harper One.

Chicago Style (17th ed.) Citation

Lewis, C.S. The Screwtape Letters: Screwtape Proposes a Toast. New York: Harper One, 2001.

MLA (9th ed.) Citation

Lewis, C.S. The Screwtape Letters: Screwtape Proposes a Toast. Harper One, 2001.