1. Le Begaiement;Ajuriaguerra;Presse Medicale,1958
2. Amster, B. (1984). The rate of speech of normal preschool children. Ph.D. dissertation, Temple University, Philadelphia.
3. The syndrome of stuttering;Andrews,1964
4. Berlin, A.J. (1954). An exploratory attempt to isolate types of stuttering. Ph.D. dissertation, Northwestern University, Chicago.
5. A handbook of stuttering;Bloodstein,1987