Cita APA (7a ed.)

Wagner, R., & Porter, A. (1977). The ring of the Nibelung. Faber Music.

Cita Chicago Style (17a ed.)

Wagner, Richard, 与 Andrew Porter. The Ring of the Nibelung. London: Faber Music, 1977.

Cita MLA (9a ed.)

Wagner, Richard, 与 Andrew Porter. The Ring of the Nibelung. Faber Music, 1977.