References
- DeRuyter, F. and Lafontaine, L. M. (1987). The Nonspeaking Brain-Injured: A Clinical and Demographic Database Report. Augmenta-five and Alternative Communication, 3, 18–25.
- Hagen, C. Malkmus, D., and Durham, P. (1979). Levels of Cognitive functions. In Rehabilitation of Head Injured Adult: Comprehensive Physical Management. Professional Staff Association of Rancho Los Amigos Hospital, Downey, CA.
- Jennett, B., and Teasdale, G. (1981). Management of Head Injuries. F. A. Davis, Philadelphia, PA.