| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Incredible Book of Vatican Facts and Papal Curiosities | 978-0-517-22083-2 (0-517-22083-0) | 2002 |
| The Incredible Book of Vatican Facts and Papal Curiosities: A Treasury of Trivia | 978-0-7648-0171-6 (0-7648-0171-6) | 1997 |