APA (7th ed.) Citation

Lewis, C. S. (2001). The Screwtape letters: With Screwtape proposes a toast. HarperCollins Publ.

Chicago Style (17th ed.) Citation

Lewis, C. S. The Screwtape Letters: With Screwtape Proposes a Toast. London: HarperCollins Publ, 2001.

MLA (8th ed.) Citation

Lewis, C. S. The Screwtape Letters: With Screwtape Proposes a Toast. HarperCollins Publ, 2001.

Warning: These citations may not always be 100% accurate.