Barton, R., & Dal Vera, R. (2017). Voice: Onstage and off (Third edition.). Routledge.
Lua i Stíl Chicago (17ú heag.)Barton, Robert, agus Rocco Dal Vera. Voice: Onstage and off. Third edition. New York, NY: Routledge, 2017.
Lua MLA (9ú heag.)Barton, Robert, agus Rocco Dal Vera. Voice: Onstage and off. Third edition. Routledge, 2017.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.