Norwich, John Julius (1989): , Knopf Westermann, Pauly-Wissowa Adam, Brian: Davidson, Ivor J. (2005): , Chapter 11, , Volume 2 of Baker History of the Church, ISBN 0-8010-1275-9 Victor av Vita; Victor, John Moorhead, red. (1992): , Liverpool University Press, ISBN 0-85323-127-3. Skrevet 484 e.Kr..