Cita APA

Weisstein, U. (1969). The essence of opera. New York: W.W. Norton & Company, Inc.

Citación estilo Chicago

Weisstein, Ulrich. The Essence of Opera. New York: W.W. Norton & Company, Inc, 1969.

Cita MLA

Weisstein, Ulrich. The Essence of Opera. New York: W.W. Norton & Company, Inc, 1969.