Cita APA (7th ed.)

Emmons, S., & Thomas, A. (1998). Power performance for singers: Transcending the barriers. Oxford University Press.

Cita Chicago (17th ed.)

Emmons, Shirlee, i Alma Thomas. Power Performance for Singers: Transcending the Barriers. New York: Oxford University Press, 1998.

Cita MLA (9th ed.)

Emmons, Shirlee, i Alma Thomas. Power Performance for Singers: Transcending the Barriers. Oxford University Press, 1998.