GRAJEWSKI , C. The Gradual as an Example of Liturgical Books Funded by Jan Łaski. Seminare. Learned Investigations, [S. l.], v. 36, n. 2, p. 187–196, 2022. DOI: 10.21852/sem.2015.2.15. Disponível em: https://czasopisma.uksw.edu.pl/index.php/s/article/view/10985. Acesso em: 19 may. 2024.