Wagner, R., & Porter, A. (1977). The ring of the Nibelung. Faber Music.
Lua i Stíl Chicago (17ú heag.)Wagner, Richard, agus Andrew Porter. The Ring of the Nibelung. London: Faber Music, 1977.
Lua MLA (9ú heag.)Wagner, Richard, agus Andrew Porter. The Ring of the Nibelung. Faber Music, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.