Emperor Michael Palaeologus and the West, 1258-1282: A Study in Byzantine-Latin Relations1973
Byzantium and the Renaissance: Greek Scholars in Venice: Studies in the Dissemination of Greek Learning from Byzantium to Western Europe1973
Byzantine East and Latin West: Two Worlds of Christendom in Middle Ages and Renaissance: Studies in Ecclesiastical and Cultural History1976
Interaction of the “Sibling” Byzantine and Western Cultures in the Middle Ages and Italian Renaissance (330-1600)1976
Byzantium: Church, Society, and Civilization Seen through Contemporary Eyes1984
Constantinople and the West: Essays on the Late Byzantine (Palaeologan) and Italian Renaissances and the Byzantine and Roman Churches1989
A Short History of the Ecumenical Patriarchate of Constantinople (330-1990): First Among Equals in the Eastern Orthodox Church1990
Greek Scholars in Venice: Studies in the Dissemination of Greek Learning from Byzantium to Western Europe2011