APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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