KĄTNY, Andrzej. Schriftenverzeichnis von Professor Ulrich Engel. Studia Germanica Gedanensia, [S. l.], n. 39, p. 338–342, 2018. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/SGG/article/view/1988. Acesso em: 3 maj. 2025.