| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Tolkien: A Critical Assessment | 978-0-333-53896-8 (0-333-53896-X) | 1992 |
| Tolkien: A Cultural Phenomenon, 2nd Edition | 978-1-4039-1263-3 (1-4039-1263-7) | 2004 |
| Tolkien, un fenomeno culturale | 978-88-211-8576-2 (88-211-8576-1) | 2009 |