- Carpenter, Humphrey, ed. (2023) [1981]. The Letters of J. R. R. Tolkien Revised and Expanded Edition. New York: Harper Collins. ISBN 978-0-35-865298-4.
- Faulkner, Peter (1995). William Morris: The Critical Heritage. London: Routledge and Kegan Paul. ISBN 0-7100-7520-0.
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