APA (7th ed.) Citation

Wagner, R., & Kühn, E. E. F. (1914). Richard Wagners Musikdramen. Globus.

Chicago Style (17th ed.) Citation

Wagner, Richard, and Edmund E. F. Kühn. Richard Wagners Musikdramen. Berlin: Globus, 1914.

MLA (9th ed.) Citation

Wagner, Richard, and Edmund E. F. Kühn. Richard Wagners Musikdramen. Globus, 1914.