Cita APA (7a ed.)

Howard, J. T. (1948). The world's great operas. Random House.

Cita Chicago Style (17a ed.)

Howard, John Tasker. The World's Great Operas. New York: Random House, 1948.

Cita MLA (9a ed.)

Howard, John Tasker. The World's Great Operas. Random House, 1948.