SWOBODA, Wincenty. Bulgaria and Bulgarians in the eyes of Poles of the XIIth–XVIIth centuries. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 2, p. 235–254, 1985. DOI: 10.14746/bp.1985.2.17. Disponível em: https://pressto.amu.edu.pl/index.php/bp/article/view/54828. Acesso em: 4 oct. 2026.