Cita APA (7th ed.)

Wagner, W. R. (2013). Opera y drama (1a. ed.). Akal.

Cita Chicago (17th ed.)

Wagner, Wilhelm Richard. Opera Y Drama. 1a. ed. Madrid: Akal, 2013.

Cita MLA (9th ed.)

Wagner, Wilhelm Richard. Opera Y Drama. 1a. ed. Akal, 2013.