| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| A History of the Expansion of Christianity: The Thousand Years of Uncertainity | 978-0-310-27371-4 (0-310-27371-4) | 1978 |
| History of Expansion of Christianity: the First Five Centuries | 978-0-310-27361-5 (0-310-27361-7) | 2000 |