↑Vasilios Makrides, Hellenic Temples and Christian Churches: A Concise History of the Religious Cultures of Greece from Antiquity to the Present (New York: New York University Press, 2009), p. 164
↑Andrew Louth, Greek East and Latin West: The Church, AD 681-1071 (New York: St Vladimir’s Seminary Press, 2007), p. 159
↑Cyril A. Mango, Byzantium: The Empire of New Rome (New York: Charles Scribner's Sons, 1980), p. 168
↑ Warren T.Treadgold, 'Review: Patriarch Photios of Constantinople: His Life, Scholarly Contributions, and Correspondence together with a Translation of Fifty-Two of His Letters by Despina Stratoudaki White; The Patriarch and the Prince: The Letter of Patriarch Photios of Constantinople to Khan Boris of Bulgaria by Despina Stratoudaki White; Joseph R. Berrigan Jr.". Speculum (Medieval Academy of America) Vol 58, No. 4 (October 1983), pp. 1100–1102. JSTOR 2853829