| title | | ISBN-13 | year of publica-
tion | other author(s) |
|---|
| AD 33: The Year That Changed the World | | 978-0-8308-3396-2 | 2007 |
| AD 33: The Year That Changed the World | | 978-0-7509-3975-1 | 2006 |
| A Field Guide to Narnia | | 978-0-8308-3207-1 | 2004 |
| Dictionary of Biblical Imagery | | 978-0-8308-1451-0 | 1998 | Leland Ryken · Jim Wilhoit · Tremper Longman · Douglas Penney · Daniel G. Reid |
| Field Guide to Harry Potter | | 978-0-8308-3430-3 | 2007 |
| Francis Schaeffer: An Authentic Life | | 978-1-58134-857-6 | 2008 |
| Francis Schaeffer - An Authentic Life | | 978-1-84474-310-0 | 2008 |
| Streifzüge durch Narnia. Die faszinierende Welt von C. S. Lewis von A bis Z | | 978-3-86591-017-2 | 2005 |
| The C.S. Lewis Chronicles: The Indispensable Biography of the Creator of Narnia Full of Little-Known Facts, Events and Miscellany | | 978-0-9742405-8-9 | 2005 |
| The C.S. Lewis Encyclopedia | | 978-0-88486-318-2 | 1996 |
| The C.S.Lewis Encyclopedia: A Comprehensive Guide to His Life, Thought and Writings | | 978-1-902694-26-9 | 2002 |
| The Inklings Handbook: A Comprehensive Guide to the Lives, Thought and Writings of C.S. Lewis, J.R.R. Tolkien, Charles Williams, Owen Barfiel | | 978-0-8272-1622-8 | 2001 | David Porter |
| The Inklings Handbook: The Lives, Thought and Writings of C.S. Lewis, J.R.R. Tolkien, Charles Williams, Owen Barfield and Their Friends | | 978-1-902694-13-9 | 2001 | " |
| The J. R. R. Tolkien Handbook: A Concise Guide to His Life, Writings, and World of Middle-Earth | | 978-0-8010-3014-7 | 2002 |
| The Quiet Time Companion: A Daily Guide Through the Bible | | 978-0-8308-1189-2 | 2000 | R. O. Willoughby · Alistair Hornal |
| The Unauthorised Harry Potter Companion | | 978-0-7509-4470-0 | 2007 |
| Tolkien and C.S. Lewis: The Gift of Friendship | | 978-1-58768-026-7 | 2003 |
| Tolkien and the Lord of the Rings: A Guide to Middle-Earth | | 978-1-58768-017-5 | 2001 |
| Tolkien und C. S. Lewis - Das Geschenk der Freundschaft | | 978-3-86506-058-7 | 2005 |