Most Popular Books
- The Age of Abbot Desiderius: Montecassino, The Papacy, and the Normans in the Eleventh and Early Twelfth Centuries (Oxford University Press Academic Monograph Reprints)
- Popes and Church Reform in the 11th Century
- The Register of Pope Gregory VII 1073-1085: An English Translation
- Popes, Monks and Crusaders (History Series (Hambledon Press), V. 27.)
- Lanfranc: Scholar, Monk, Archbishop
