Jacobson, David M. “Hadrianic Architecture and Geometry.” American Journal of Archaeology 90, no. 1 (1986): 69–85. https://doi.org/10.2307/505986.
Jashemski, Wilhelmina F., Eugenia Salza Prina Ricotti, and John Foss. “Preliminary Excavations in the Gardens of Hadrian’s Villa: The Canopus Area and the Piazza d’Oro.” American Journal of Archaeology 96, no. 4 (1992): 579–97. https://doi.org/10.2307/505186.