APA (7th ed.) Citation

Barton, R., & Dal Vera, R. (2011). Voice onstage and off / Robert Barton and Rocco dal Vera: Onstage and off (2nd ed.). Routledge.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.