Cita APA (7a ed.)

Metropolitan Opera (Nueva York) & Gruber, P. (1993). The Metropolitan Opera guide to recorded opera. The Metropolitan Opera Guild : Norton & Company.

Cita Chicago Style (17a ed.)

Metropolitan Opera (Nueva York) y Paul Gruber. The Metropolitan Opera Guide to Recorded Opera. New York ; London: The Metropolitan Opera Guild : Norton & Company, 1993.

Cita MLA (9a ed.)

Metropolitan Opera (Nueva York) y Paul Gruber. The Metropolitan Opera Guide to Recorded Opera. The Metropolitan Opera Guild : Norton & Company, 1993.