KEEL, William D. Helmut Huelsbergen (1929–2017): In Memoriam. Yearbook of German-American Studies, [S. l.], v. 51, p. 1–2, 2022. DOI: 10.17161/ygas.v51i.18282. Disponível em: https://journals.ku.edu/ygas/article/view/18282. Acesso em: 27 apr. 2025.