ENGEL, Ulrich. Lebenslauf bis 2019. Studia Germanica Gedanensia, [S. l.], n. 41, p. 192–202, 2019. DOI: 10.26881/sgg.2019.41.14. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/SGG/article/view/4447. Acesso em: 30 maj. 2025.