Saya mau tau Stefanos I, Patriark Konstantinopel dari Mikhaēl III

Bulgarian historical review (2005), United Center for Research and Training in History, Published by Pub. House of the Bulgarian Academy of Sciences, v.33:no.1-4.

Finlay, G. (1856), History of the Byzantine Empire from DCCXVI to MLVII, 2nd Edition, Published by W. Blackwood.

Fossier, R. (1986) The Cambridge illustrated history of the Middle Ages. Cambridge University Press.

Gjuzelev, V., (1988) Medieval Bulgaria, Byzantine Empire, Black Sea, Venice, Genoa (Centre Culturel du Monde Byzantin). Published by Verlag Baier.

Gregory, Timothy E. (2010). A History of Byzantium. Malden, Massachusetts and West Sussex, United Kingdom: Wiley-Blackwell. .

Tougher, S. (1997) The Reign of Leo VI (886–912): Politics and People. Brill, Leiden.