Rorimer, James J., and William Holmes Forsyth. "The Medieval Galleries." The Metropolitan Museum of Art Bulletin, n.s., 12, no. 6 (February 1954). p. 130.
Weitzmann, Kurt, ed. Age of Spirituality: Late Antique and Early Christian Art, Third to Seventh Century. New York: The Metropolitan Museum of Art, 1979. no. 269, pp. 290-291.
Little, Charles T., ed. Set in Stone: The Face in Medieval Sculpture. New York, New Haven, and London: The Metropolitan Museum of Art, 2006. no. 54, pp. 129-131.
Brilliant, Richard. "Faces Demanding Attention." Gesta 46, no. 2 (2007). p. 97, fig. 8.