Gómez-Moreno, Carmen. Medieval Images : A glimpse into the symbolism and reality of the Middle Ages. Katonah: Katonah Museum of Art, 1978. no. 3, pp. 4, 17.
Castelnuovo-Tedesco, Lisbeth. "Romanesque Sculpture in North American Collections. XXIII. The Metropolitan Museum of Art. Part III: Italy (2)." Gesta 24, no. 4 (1985). no. 7, pp. 161-62, fig. 10.
Castelnuovo-Tedesco, Lisbeth, and Jack Soultanian. Italian Medieval Sculpture in The Metropolitan Museum of Art and The Cloisters. New York: The Metropolitan Museum of Art, 2010. no. 14, pp. 58–60.