APA (7th ed.) Citation

Lewis, C. S. (1946). The Screwtape letters (1st published, repr.). Geoffrey Bles.

Chicago Style (17th ed.) Citation

Lewis, C. S. The Screwtape Letters. 1st published, repr. London: Geoffrey Bles, 1946.

MLA (9th ed.) Citation

Lewis, C. S. The Screwtape Letters. 1st published, repr. Geoffrey Bles, 1946.

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