ŚRUTWA, Jan. The ancient ecclesiastical organization in the territory of present-day Bulgaria. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 1, p. 311–316, 1984. DOI: 10.14746/bp.1984.1.26. Disponível em: https://pressto.amu.edu.pl/index.php/bp/article/view/55704. Acesso em: 3 oct. 2026.