Cita APA (7a ed.)

Griffel, M. R., & Block, A. F. (1999). Operas in English: A dictionary. Greenwood Press.

Cita Chicago Style (17a ed.)

Griffel, Margaret Ross, y Adrienne Fried Block. Operas in English: A Dictionary. Westport, Conn: Greenwood Press, 1999.

Cita MLA (9a ed.)

Griffel, Margaret Ross, y Adrienne Fried Block. Operas in English: A Dictionary. Greenwood Press, 1999.