APA (7th ed.) Citation

Gammond, P. (1979). The illustrated encyclopedia of recorded opera. Harmony Books.

Chicago Style (17th ed.) Citation

Gammond, Peter. The Illustrated Encyclopedia of Recorded Opera. New York: Harmony Books, 1979.

MLA (9th ed.) Citation

Gammond, Peter. The Illustrated Encyclopedia of Recorded Opera. Harmony Books, 1979.

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