APA (7th ed.) Citation

Wagner, R., Klindworth, K., & Jameson, F. (1904). The ring of the Nibelungen. G. Schirmer.

Chicago Style (17th ed.) Citation

Wagner, Richard, Karl Klindworth, and Frederick Jameson. The Ring of the Nibelungen. New York: G. Schirmer, 1904.

MLA (8th ed.) Citation

Wagner, Richard, et al. The Ring of the Nibelungen. G. Schirmer, 1904.