1. Alreck P. L. & Settle R. B. (1994). The survey research handbook. New York NY: McGraw-Hill.
2. American Speech-Language-Hearing Association. (1995). Guidelines for practice in stuttering treatment [Guidelines]. Available from www.asha.org/policy.
3. Studies in the Psychology of Stuttering: XIX
4. Bloodstein O. (1995). A handbook on stuttering (5 th ed.). San Diego CA: Singular.
5. Brookshire R. H. (2003). Introduction to neurogenic communication disorders (6 th ed.). St. Louis MO: Mosby.