Gates, R., Forrest, L. A., & Obert, K. (2013). The owner's manual to the voice: A guide for singers and other professional voice users. Oxford University Press.

Gates, Rachael, L. Arick Forrest, and Kerrie Obert. The Owner's Manual to the Voice: A Guide for Singers and Other Professional Voice Users. Oxford ; New York: Oxford University Press, 2013.

Gates, Rachael, et al. The Owner's Manual to the Voice: A Guide for Singers and Other Professional Voice Users. Oxford University Press, 2013.