- A History of Medieval Spain
- Reconquest And Crusade In Medieval Spain (The Middle Ages Series)
- Alfonso X, the Justinian of His Age: Law and Justice in Thirteenth-Century Castile
- The Latin Chronicle of the Kings of Castile (Medieval & Renaissance Texts & Studies (Series), V. 236)
- The Learned King: The Reign of Alfonso X of Castile (Middle Ages Series)