APA (7th ed.) Citation

Lewis, C. S. (1945). The problem of pain. The Macmillan Company.

Chicago Style (17th ed.) Citation

Lewis, C. S. The Problem of Pain. New York: The Macmillan Company, 1945.

MLA (9th ed.) Citation

Lewis, C. S. The Problem of Pain. The Macmillan Company, 1945.