SCHAARWÄCHTER, Jürgen. Stephan Sebastian Schmidt: Opera Impura. Formen engagierter Oper in England. Die Musikforschung, [S. l.], v. 58, n. 4, p. 468–470, 2005. DOI: 10.52412/mf.2005.H4.4910. Disponível em: https://mf.journals.qucosa.de/mf/article/view/4910. Acesso em: 19 apr. 2025.