LESZKA, Mirosław J. Christo Trendafilov, Mladostta na car Simeon, PAM Păblišing Kămpanii OOD, Sofija 2010, ss. 126. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 18, p. 197–201, 2011. DOI: 10.14746/bp.2011.18.20. Disponível em: https://presstoarch.amu.edu.pl/index.php/bp/article/view/54676. Acesso em: 8 sep. 2026.