Garland, Lynda. "Zoe Porphyrogenita (wife of Romanus III, Constantine IX, and Michael IV)", De Imperatoribus Romanis (2006) Treadgold, Warren. A History
Lexington: Lexington Books, ISBN 0-7391-1977-X Mann, Horace K. (1913). «Pope Constantine». Catholic Encyclopedia. New York: Robert Appleton Company. ვიკისაწყობში
(1993), The Emperor Constantine, London. ISBN 0-7538-0528-6 Lenski, Noel E. (2011) The Cambridge Companion to the Age of Constantine, Cambridge University