↑ W. Treadgold, A History of the Byzantine State and Society, 819
↑ Greco-Latin relations on the eve of the Byzantine restoration: the Battle of Pelagonia Page 136, by Deno John Geanakoplos, Dumbarton Oaks Papers 7 (1953)
↑ Speculum, Volume 29 By Mediaeval Academy of America - Page 801 (1954)
↑ Proceedings of the 21st International Congress of Byzantine Studies, London Page 370 ISBN 0-7546-5740-X
↑ George Akropolites: the history. By R. J. Macrides Page 363 (2007)
↑ Ostrogorsky, George, History of the Byzantine State, (Rutgers University Press, 1969), 447-448.
