Oxford University Press · Princeton University Press
| title | media type | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|---|
| A Most Holy War: The Albigensian Crusade and the Battle for Christendom | Hardcover | 978-0-19-517131-0 (0-19-517131-4) | 2008 |
| A Most Holy War: The Albigensian Crusade and the Battle for Christendom | Paperback | 978-0-19-539310-1 (0-19-539310-4) | 2008 |
| The Corruption of Angels: The Great Inquisition of 1245-1246 | " | 978-0-691-12371-4 (0-691-12371-3) | 2005 |
G. P. · M G*** · M. Gregory · M P · Mark Gregory · Mark Pegg · Pegg Mark Gregory