APA (7th ed.) Citation

Wagner, R., & Mann, W. (1973). Siegfried: Opera in three acts (1st ed., 2nd repr.). Friends of Covent Garden.

Chicago Style (17th ed.) Citation

Wagner, Richard, and William Mann. Siegfried: Opera in Three Acts. 1st ed., 2nd repr. London: Friends of Covent Garden, 1973.

MLA (9th ed.) Citation

Wagner, Richard, and William Mann. Siegfried: Opera in Three Acts. 1st ed., 2nd repr. Friends of Covent Garden, 1973.

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