JAMROŻEK, Wiesław. Jan Hellwig (1931-2000). Biuletyn Historii Wychowania, [S. l.], n. 13/14, p. 5–6, 2001. DOI: 10.14746/bhw.2001.13.14.0. Disponível em: https://pressto.amu.edu.pl/index.php/bhw/article/view/17941. Acesso em: 17 cze. 2024.