| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| A Hobbit, a Wardrobe, and a Great War: How J. R. R. Tolkien and C. S. Lewis Rediscovered Faith, Friendship, and Heroism in the Cataclysm of 1914-1918 | 978-0-7180-2176-4 (0-7180-2176-2) | 2015 |
| The Searchers: A Quest for Faith in the Valley of Doubt | 978-1-59555-446-8 (1-59555-446-7) | 2012 |