ROCH, Eckhard. Das Undine-Motiv in Richard Wagners Dramenkonzeption. Die Musikforschung, [S. l.], v. 51, n. 3, p. 302–315, 1998. DOI: 10.52412/mf.1998.H3.945. Disponível em: https://mf.journals.qucosa.de/mf/article/view/945. Acesso em: 19 apr. 2025.