Wagner, R., & Porter, A. (1977). The ring of the Nibelung. Faber Music.
Chicago-čujuhus (17. p.)Wagner, Richard, juo Andrew Porter. The Ring of the Nibelung. London: Faber Music, 1977.
MLA-čujuhus (9. p.)Wagner, Richard, juo Andrew Porter. The Ring of the Nibelung. Faber Music, 1977.
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