APA (7th ed.) Citation

Lewis, C. S., & Howard, G. (2006). The screwtape letters (Unabridged.). Blackstone Audio, Inc., and Buck 50 Productions, LLC.

Chicago Style (17th ed.) Citation

Lewis, C. S., and Geoffrey Howard. The Screwtape Letters. Unabridged. Ashland: Blackstone Audio, Inc., and Buck 50 Productions, LLC, 2006.

MLA (8th ed.) Citation

Lewis, C. S., and Geoffrey Howard. The Screwtape Letters. Unabridged. Blackstone Audio, Inc., and Buck 50 Productions, LLC, 2006.

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