Vikan, Gary. Catalogue of the Sculpture in the Dumbarton Oaks Collection from the Ptolemaic Period to the Renaissance. Washington, D.C.: Dumbarton Oaks, 1995. pp. 87–90, fig. 35.1a, b.
Cahn, Walter, and Linda Seidel. Romanesque Sculpture in American Collections: Volume 2, New York and New Jersey, Middle and South Atlantic States, the Midwest, Western and Pacific States. Turnhout: Brepols, 1999. p. 116.