APA (7th ed.) Citation

Lewis, C. S. (1942). The Screwtape letters / by C.S. Lewis. Bles.

Chicago Style (17th ed.) Citation

Lewis, C. S. The Screwtape Letters / by C.S. Lewis. Bles, 1942.

MLA (9th ed.) Citation

Lewis, C. S. The Screwtape Letters / by C.S. Lewis. Bles, 1942.

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