- The Circle of War in the Middle Ages: Essays on Medieval Military and Naval History
- The Usatges of Barcelona: The Fundamental Law of Catalonia (Middle Ages Series)
- Hospitaller Piety and Crusader Propaganda: Guillaume Caoursin's Description of the Ottoman Siege of Rhodes, 1480
- Conflict in Fourteenth-Century Iberia: Aragon vs. Castile and the War of the Two Pedros
- Elionor of Sicily, 1325–1375: A Mediterranean Queen of Two Worlds