Savvides, Alexis G. C.
"Review of Who Was Who in Medieval Bulgaria, by Jordan Andreev, Ivan Lazarov, and Plamen Pavlov and Byzantine Emperors, by Ivan Bozhilov, Ivan Biljarski, Hristo Dimitrov, and Ilija Iliev,"
Medieval Prosopography: Vol. 20
, Article 12.
Available at: https://scholarworks.wmich.edu/medpros/vol20/iss1/12