Citazione Stile APA (7a Edizione)

Wagner, R., & Porter, A. (1976). The Ring of the Nibelung (1st American ed.). W. W. Norton.

Citazione stile Chigago Style (17a edizione)

Wagner, Richard, e Andrew Porter. The Ring of the Nibelung. 1st American ed. New York: W. W. Norton, 1976.

Citatione MLA (9a ed.)

Wagner, Richard, e Andrew Porter. The Ring of the Nibelung. 1st American ed. W. W. Norton, 1976.