Tolong jelaskan mengenai Lihat pula dari Konsili Konstantinopel III

Ekonomou, Andrew J. 2007. Byzantine Rome and the Greek Popes: Eastern influences on Rome and the papacy from Gregory the Great to Zacharias, A.D. 590–752. Lexington Books.

Ostrogorsky, George. History of the Byzantine State. New Brunswick: Rutgers University Press.