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"Concilium Universale Constantinopolitanum Tertium", in Acta Conciliorum Oecumenicorum, ser. 2, II.1–2. ed. R. Riedinger (Berlin 1990 and 1992).

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. ISBN 0-8135-0599-2