Fentress, E., T. Clay, M. Hobart, and M. Webb. "Late Roman and Medieval Cosa I: The Arx and the structure near the eastern height." Papers of the British School at Rome 59 (1991): 197-230.

Fentress, E., T. Clay, M. Hobart, and M. Webb. "Late Roman and Medieval Cosa I: The Arx and the structure near the eastern height." Papers of the British School at Rome 59 (1991): 197-230.