MAĆKIEWICZ, Jolanta. Walery Pisarek (1931–2017). Media Biznes Kultura, [S. l.], n. 2(3), p. 171, 2017. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/MBK/article/view/8718. Acesso em: 9 cze. 2025.