Cita APA (7th ed.)

Gammond, P. (1989). Bluff your way in opera. Ravette Books.

Cita Chicago (17th ed.)

Gammond, Peter. Bluff Your Way in Opera. London: Ravette Books, 1989.

Cita MLA (9th ed.)

Gammond, Peter. Bluff Your Way in Opera. Ravette Books, 1989.