Hughes, Heather. "A Hidden Gem at the Penn Museum." Expedition: The Magazine of the University of Pennsylvania Museum of Archaeology and Anthropology 52, no. 2. (2010): 5. See: p. 5
Popovich, Ljubica. "A Byzantine Cameo." Expedition: The Magazine of the University of Pennsylvania Museum of Archaeology and Anthropology 4, no. 3. (1962): 28-33.
Vermeule, Cornelius C. The Sommerville Gem Collection of the University Museum of Archaeology and Anthropology. The University Museum, 1956. See: no. 319