APA (7th ed.) Citation

Wagner, R. (1981). Der Ring des Nibelungen. Philips.

Chicago Style (17th ed.) Citation

Wagner, Richard. Der Ring Des Nibelungen. [S. l.]: Philips, 1981.

MLA (8th ed.) Citation

Wagner, Richard. Der Ring Des Nibelungen. Philips, 1981.

Warning: These citations may not always be 100% accurate.