APA Style

Lewis, C, S. (1980). Mere Christianity : comprising The case for Christianity ; Christian behaviour and Beyond personality / C.S. Lewis. . New York, NY.: Simon & Schuster.

MLA Style

Lewis, C., S.. "Mere Christianity : comprising The case for Christianity ; Christian behaviour and Beyond personality / C.S. Lewis.". New York, NY.: Simon & Schuster, 1980. Text.