Marinow, K. and Brzozowska, Z.A. (2018) “Sources and Modern Scholarship”, in Leszka, M.J. (ed.) The Bulgarian State in 927-969. The Epoch of Tsar Peter I: No. XXXIV. Poland: Lodz University Press (Byzantina Lodziensia), pp. 5–20. doi:10.18778/8142-115-7.02.