APA (7th ed.) Citation

Lewis, C. S., & Lewis, W. H. (1966). Letters. Bles.

Chicago Style (17th ed.) Citation

Lewis, C. S., and W. H. Lewis. Letters. London: Bles, 1966.

MLA (9th ed.) Citation

Lewis, C. S., and W. H. Lewis. Letters. Bles, 1966.

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