1. American Choral Directors Association. (2006). Choral Journal, 47(5).
2. Barrett, M. S., & Stauffer, S. L. (Eds.). (2009). Narrative inquiry in music education: Troubling certainty. New York: Springer.
3. Brozo, W. G., & Gaskins, C. (2009). Engaging texts and literacy practices for adolescent boys. In K. D. Wood & W. E. Blanton (Eds.), Literacy instruction for adolescents: Research-based practice (pp. 170–186). New York: The Guilford Press.
4. Chorus America. (2009). The chorus impact study: How children, adults, and communities benefit from choruses. Washington, DC: Author. Retrieved August 14, 2011, from
http://www.chorusamerica.org/about_choralsinging.cfm
5. Cooksey, J. (1989). Understanding male-adolescent voice maturation: Some significant contributions by European and American researchers. In G. Paine (Ed.), Five centuries of choral music: Essays in honor of Howard Swan (pp. 75–92). Hillsdale, NY: Pendragon Press.