1983 - Primavera: An Introduction to Italian, with Helen McFie and Luigi Sera. New York: Holt, Rinehart and Winston. (With accompanying laboratory and exercise workbooks)
1987 - The Arabic Role in Medieval Literary History:A Forgotten Heritage. Philadelphia: University of Pennsylvania Press.
2002 - The Ornament of the World: How Muslims, Jews, and Christians Created a Culture of Tolerance in Medieval Spain. New York: Little, Brown and Company.
2008 - The Arts of Intimacy: Christians, Jews, and Muslims in the Making of Castilian Culture. With Jerrilynn Dodds and Abigail Krasner Balbale. New Haven and London: Yale University Press.
