NIKOLOV, Georgi N. State Organisation and Power Hierarchy in the Bulgarian Empire (927–969). W: LESZKA, Mirosław J. (red.). The Bulgarian State in 927-969. The Epoch of Tsar Peter I: No. XXXIV. Byzantina LodziensiaPoland: Wydawnictwo Uniwersytetu Łódzkiego,2018. p. 257–268. DOI: 10.18778/8142-115-7.14. Disponível em: https://press.uni.lodz.pl/index.php/wul/catalog/book/1057/chapter/2734. Acesso em: 28 sty. 2026.