References
- Beukelman, D. R., Yorkston, K. M., Reichle, J. (Eds.). (2000). Aug-mentative and alternative communication for adults with acquired neurologic disorders. Baltimore: Paul H. Brookes.
- Romski, M. A., & Sevcik, R. A. (1996). Breaking the speech bar-rier: Language development through augmented means. Balti-more: Paul H. Brookes.