APA (7th ed.) Citation

Lewis, C. S. (1966). The problem of pain. Macmillan.

Chicago Style (17th ed.) Citation

Lewis, C. S. The Problem of Pain. Macmillan, 1966.

MLA (9th ed.) Citation

Lewis, C. S. The Problem of Pain. Macmillan, 1966.

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