FLAD, S. Karl Widmaier als Musiker. Zollerheimat, [S. l.], v. 1, n. 10, p. 69–70, 1932. DOI: 10.53458/zh.v1i10.8704. Disponível em: https://journals.wlb-stuttgart.de/ojs/index.php/zh/article/view/8704. Acesso em: 23 juli. 2024.