Moravcsik and translated by R. J. H. Jenkins, Dumbarton Oaks Center for Byzantine Studies, Washington D. C., 1993*P. Radonjić, "„Velaj“", u: "Srpski biografski rečnik", II tom, ur.
Moravcsik and translated by R. J. H. Jenkins, Dumbarton Oaks Center for Byzantine Studies, Washington D. C., 1993.