Cita APA (7a ed.)

Lewis, C. S. (1968). The Screwtape letters and Screwtape proposes a toast. Macmillan.

Cita Chicago Style (17a ed.)

Lewis, C. S. The Screwtape Letters and Screwtape Proposes a Toast. New York: Macmillan, 1968.

Cita MLA (9a ed.)

Lewis, C. S. The Screwtape Letters and Screwtape Proposes a Toast. Macmillan, 1968.