APA (7th ed.) Citation

Lewis, C. S., & Hooper, W. (2004). Collected letters: II, Books, broadcasts and war, 1931-1949. HarperCollins.

Chicago Style (17th ed.) Citation

Lewis, C. S., and Walter Hooper. Collected Letters: II, Books, Broadcasts and War, 1931-1949. London: HarperCollins, 2004.

MLA (9th ed.) Citation

Lewis, C. S., and Walter Hooper. Collected Letters: II, Books, Broadcasts and War, 1931-1949. HarperCollins, 2004.

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