Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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