APA (7th ed.) Citation

Barton, R., & Dal Vera, R. (2011). Voice: Onstage and off (2nd ed.). Routled.

Chicago Style (17th ed.) Citation

Barton, Robert, and Rocco Dal Vera. Voice: Onstage and off. 2nd ed. London: Routled, 2011.

MLA (9th ed.) Citation

Barton, Robert, and Rocco Dal Vera. Voice: Onstage and off. 2nd ed. Routled, 2011.