Stoner, J., Beck, A., Bock, S., Hickey, K., Kosuwan, K., & Thompson, J. (2006). The effectiveness of the Picture Exchange Communication System with nonspeaking adults.

Remedial and Special Education, 27, 154‐165.
Abstract: Picture Exchange Communication System (PECS) training was implemented with 5 nonspeaking adults with mental retardation who were not currently using any type of functional communication system. Lee Mas...