APA (7th ed.) Citation

(1976). Kobbé's complete opera book (9. ed.). Putnam.

Chicago Style (17th ed.) Citation

Kobbé's Complete Opera Book. 9. ed. London: Putnam, 1976.

MLA (9th ed.) Citation

Kobbé's Complete Opera Book. 9. ed. Putnam, 1976.

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