SYPKO, B. Alfred Steinert – archiwista, muzealnik, historyk Opola. Annales Collegii Nobilium Opolienses, [S. l.], n. 6, p. 269–276, 2017. Disponível em: https://acno.pl/index.php/acno/article/view/28. Acesso em: 19 maj. 2024.