Cita APA (7th ed.)

Barton, R., & Dal Vera, R. (2017). Voice: Onstage and off (Third edition.). Routledge.

Cita Chicago (17th ed.)

Barton, Robert, i Rocco Dal Vera. Voice: Onstage and off. Third edition. New York, NY: Routledge, 2017.

Cita MLA (9th ed.)

Barton, Robert, i Rocco Dal Vera. Voice: Onstage and off. Third edition. Routledge, 2017.