GUGGISBERG, Hans Rudolf. Philip Schaff’s Vision of America. Yearbook of German-American Studies, [S. l.], v. 25, p. 23–34, 1990. DOI: 10.17161/ygas.v25i.19261. Disponível em: https://journals.ku.edu/ygas/article/view/19261.. Acesso em: 3 nov. 2024.