APA

Orrey L., Chase G., . (1976). The Encyclopedia of opera. New York: Scribner.

Chicago

Orrey Leslie, Chase Gilbert, . 1976. The Encyclopedia of opera. New York: Scribner.

Harvard

Orrey L., Chase G., . (1976). The Encyclopedia of opera. New York: Scribner.

MLA

Orrey Leslie, Chase Gilbert, . The Encyclopedia of opera. New York: Scribner. 1976.