References
- Lewis, C. S. The Abolition of Man. London: Oxford University Press, 1943.
- Lewis, C. S. The Collected Letters of C. S. Lewis, vol. 3, ed. Walter Hooper. New York: HarperCollins, 2006.
- Lewis, C. S. Mere Christianity. New York: HarperCollins, 2009.
- Tolkien, J. R. R. The Letters of J. R. R. Tolkien, ed. Humphrey Carpenter. New York: HarperCollins, 2006.