O'BRIEN, George M. A Minnesotan at the University of Berlin in the 1870s: The Graduate Studies of Alexander Vander Horck. Yearbook of German-American Studies, [S. l.], v. 29, p. 91–106, 1994. DOI: 10.17161/ygas.v29i.19200. Disponível em: https://journals.ku.edu/ygas/article/view/19200.. Acesso em: 22 jul. 2024.