WAGNER, R. 30 Jahre Backnanger Schlüsselhilfe. Backnanger Jahrbuch, [S. l.], v. 16, p. 263, 2008. DOI: 10.53458/bjb.v16i.9360. Disponível em: https://journals.wlb-stuttgart.de/index.php/bjb/article/view/9360. Acesso em: 13 mai. 2025.