SZCZĘK, Joanna. Zur positiven und negativen Höflichkeit in deutschen Absageschreiben. Studia Germanica Gedanensia, [S. l.], n. 27, p. 76–88, 2012. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/SGG/article/view/1580. Acesso em: 2 maj. 2024.