KEEL, William D. Daniel C. Niitzel (1962—2013): In Memoriam. Yearbook of German-American Studies, [S. l.], v. 47, p. 1–4, 2012. DOI: 10.17161/ygas.v47i.18773. Disponível em: https://journals.ku.edu/ygas/article/view/18773.. Acesso em: 17 may. 2024.