BREIG, Werner. Udo Bermbach: Der anthroposophe Wagner. Rudolf Steiner über Richard Wagner. Die Musikforschung, [S. l.], v. 76, n. 4, p. 449–450, 2023. DOI: 10.52412/mf.2023.H4.4303. Disponível em: https://mf.publia.org/mf/article/view/4303. Acesso em: 24 juni. 2026.