Cita APA (7th ed.)

Lewis, C. S. (1982). The screwtape letters: With screwtape proposes a toast. Collier books.

Cita Chicago (17th ed.)

Lewis, C. S. The Screwtape Letters: With Screwtape Proposes a Toast. New York: Collier books, 1982.

Cita MLA (9th ed.)

Lewis, C. S. The Screwtape Letters: With Screwtape Proposes a Toast. Collier books, 1982.