KAUFHOLZ, C. Frederick. Few Württemberg Families of Grafenberg, Kohlberg, Riederich & Tischardt. Journal of German-American Studies, [S. l.], v. 12, n. 1, p. 1–21, 1977. Disponível em: https://journals.ku.edu/jgas/article/view/19998.. Acesso em: 22 jul. 2024.