Cita APA (7a ed.)

Wagner, R., & Robb, S. (1960). Siegfried: Music drama in three acts (From the trilogy Der Ring des Nibelungen). G. Schirmer.

Cita Chicago Style (17a ed.)

Wagner, Richard, y Stewart Robb. Siegfried: Music Drama in Three Acts (From the Trilogy Der Ring Des Nibelungen). New York: G. Schirmer, 1960.

Cita MLA (9a ed.)

Wagner, Richard, y Stewart Robb. Siegfried: Music Drama in Three Acts (From the Trilogy Der Ring Des Nibelungen). G. Schirmer, 1960.