APA (7th ed.) Citation

Westerman, G. v., & Schumann, K. (1976). Knaurs Opernführer. Droemer-Knaur.

Chicago Style (17th ed.) Citation

Westerman, Gerhart von, and Karl Schumann. Knaurs Opernführer. München ; Zürich: Droemer-Knaur, 1976.

MLA (9th ed.) Citation

Westerman, Gerhart von, and Karl Schumann. Knaurs Opernführer. Droemer-Knaur, 1976.