Allen, M., Malde, M., & Zeller, K. A. (2009). What every singer needs to know about the body. Plural Pub..

Allen, MaryJean, Melissa Malde, and Kurt Alexander Zeller. What Every Singer Needs to Know About the Body. San Diego, CA: Plural Pub., 2009.

Allen, MaryJean, et al. What Every Singer Needs to Know About the Body. Plural Pub., 2009.