TYSZKIEWICZ, Jan. Brunon of Querfurt, missionary to non-Slavic peoples. Balcanica Posnaniensia. Acta et studia, [S. l.], v. 15, p. 33–42, 2009. DOI: 10.14746/bp.2009.15.4. Disponível em: https://presstoarch.amu.edu.pl/index.php/bp/article/view/53084. Acesso em: 8 sep. 2026.