WALCZAK, Bogdan. Historical linguist on grzeczny (‘polite’) and grzeczność (‘politeness’). Polonica, [S. l.], v. 35, p. 81–86, 2015. DOI: 10.17651/POLON.35.7. Disponível em: https://polonica.ijppan.pl/index.php/polonica/article/view/75. Acesso em: 7 nov. 2026.