TREFOUSSE, Hans L. Friedrich Hecker and Carl Schurz. Yearbook of German-American Studies, [S. l.], v. 26, p. 33–42, 1991. DOI: 10.17161/ygas.v26i.19237. Disponível em: https://journals.ku.edu/ygas/article/view/19237.. Acesso em: 12 may. 2024.