APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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