Terry Pratchett: A Life With Footnotes: The Official Biography

Tolkien's World from A to Z: The Complete Guide to Middle-Earth

The Wave in the Mind: Talks and Essays on the Writer, the Reader, and the Imagination

The Story Of Kullervo: An Epic Dark Fantasy from Finnish Mythology – Tolkien's Foundation for The Silmarillion

The Allure of the Multiverse: Extra Dimensions, Other Worlds, and Parallel Universes

The Road to Middle-Earth: How J.R.R. Tolkien Created a New Mythology

Lexicon Urthus: A Dictionary for the Urth Cycle (Sirius Fiction Dictionaries)

Jack: A Life of C. S. Lewis

The Steampunk Bible: An Illustrated Guide to the World of Imaginary Airships, Corsets and Goggles, Mad Scientists, and Strange Literature

Tolkien's Modern Reading: Middle-earth Beyond the Middle Ages