APA (7th ed.) Citation

Lewis, C. S. (1964). Letters to Malcolm, chiefly on prayer (1. publ.). Bles.

Chicago Style (17th ed.) Citation

Lewis, C. S. Letters to Malcolm, Chiefly on Prayer. 1. publ. London: Bles, 1964.

MLA (9th ed.) Citation

Lewis, C. S. Letters to Malcolm, Chiefly on Prayer. 1. publ. Bles, 1964.