Warrack, J. H. (2001). German opera: From the beginnings to Wagner. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Warrack, John Hamilton. German Opera: From the Beginnings to Wagner. Cambridge ; New York: Cambridge University Press, 2001.
Lua MLA (9ú heag.)Warrack, John Hamilton. German Opera: From the Beginnings to Wagner. Cambridge University Press, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.