Barton, R., & Dal Vera, R. (2017). Voice: Onstage and off (Third edition.). Routledge.
Chicago Style (17th ed.) ZitazioaBarton, Robert, eta Rocco Dal Vera. Voice: Onstage and off. Third edition. New York, NY: Routledge, 2017.
MLA (9th ed.) ZitazioaBarton, Robert, eta Rocco Dal Vera. Voice: Onstage and off. Third edition. Routledge, 2017.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.