HOPPE, I. 70er-Feier der Jahrgänge 1932/33. Backnanger Jahrbuch, [S. l.], v. 11, p. 249–251, 2003. DOI: 10.53458/bjb.v11i.9159. Disponível em: https://journals.wlb-stuttgart.de/ojs/index.php/bjb/article/view/9159. Acesso em: 23 juli. 2024.