SCHLETZ, Alfons. Unknown sermons by Fr. A. Biernacki from the second half of the 18th century. Our Past, [S. l.], v. 7, p. 129–138, 1958. DOI: 10.52204/np.1958.7.129-138. Disponível em: https://ojs.academicon.pl/np/article/view/7574. Acesso em: 6 nov. 2026.