APA (7th ed.) Citation

Vanauken, S., & Lewis, C. S. (2009). A severe mercy. Harper One.

Chicago Style (17th ed.) Citation

Vanauken, Sheldon, and C. S. Lewis. A Severe Mercy. [San Francisco]: Harper One, 2009.

MLA (9th ed.) Citation

Vanauken, Sheldon, and C. S. Lewis. A Severe Mercy. Harper One, 2009.