1. Facts on Stuttering (Stuttering Foundation of America web site) Copyright © 1991-2005 Stuttering Foundation of America. Available at: http://www.stutteringhelp.org/Default.aspx?tabid=17. Accessed April 10, 2006.
2. US Census Bureau. Population Estimates. 2004.
3. Stuttering: A brief review.;Lawrence;Am Fam Physician,1998
4. Epidemiology of stuttering in the community across the entire life span.;Ashley;J Speech Lang Hear Res,2002
5. Stuttering and stammering.;Guitar;Pediatr Rev,1985