- The Art of the Byzantine Empire: Byzantine Art in the Middle Ages
- Treasures of Venice
- Byzantium, From the Death of Theodosius to the Rise of Islam.
- Christian iconography: A study of its origins: the A. W. Mellon lectures in the fine arts, 1961, the National Gallery of Art, Washington, D.C.;
- Romanesque Painting From The Eleventh To The Thirteenth Century: The Great Centuries Of Painting