Cita APA (7a ed.)

Reid, C. L. (2018). The free voice: A guide to natural singing (50th anniversary edition.). Oxford University Press.

Cita Chicago Style (17a ed.)

Reid, Cornelius L. The Free Voice: A Guide to Natural Singing. 50th anniversary edition. New York, NY: Oxford University Press, 2018.

Cita MLA (9a ed.)

Reid, Cornelius L. The Free Voice: A Guide to Natural Singing. 50th anniversary edition. Oxford University Press, 2018.