APA (7th ed.) Citation

University of Pennsylvania. University Museum, Sommerville, M., & Vermeule, C. C. (1956). Cameo and intaglio: Engraved gems from the Sommerville Collection. The University.

Chicago Style (17th ed.) Citation

University of Pennsylvania. University Museum, Maxwell Sommerville, and Cornelius C. Vermeule. Cameo and Intaglio: Engraved Gems from the Sommerville Collection. Philadelphia: The University, 1956.

MLA (9th ed.) Citation

University of Pennsylvania. University Museum, et al. Cameo and Intaglio: Engraved Gems from the Sommerville Collection. The University, 1956.