1. WHO. Manual of the international statistical classification of diseases, injuries and cases of death. Geneva: World Health Organization; 1977.
2. Riper Ch van. Final thoughts about stuttering. Journal of Fluency Disorders 1990;15:317-8.
3. Laroes E, Franken MCH. Stotteren. Tijdschrift voor Huisartsgeneeskunde 1995;12.
4. Guitar B, Conture EG. The child who stutters: to the family physician. Publication no. 2. Memphis: Stuttering Foundation of America; 1992.
5. Mulligan HF, Anderson TJ, et al. Tics and development stuttering. Parkinsonism & related disorders. 2003;9:281-9.