Portret bydgoszczanina. Januszowi Umińskiemu promemoria. Kronika Bydgoska, [S. l.], v. 44, p. 489–516, 2025. DOI: 10.34767/. Disponível em: https://czasopisma.ukw.edu.pl/index.php/kronika-bydgoska/article/view/1836.. Acesso em: 5 jul. 2025.