Charlop-Christy, M. H., Carpenter, M., Le, L., LeBlanc, L. A., & Kellet, K. (2002). Using the picture exchange communication system (PECS) with children with autism: Assessment of PECS acquisition, speech, social-communicative behavior, and problem behavior.

Charlop-Christy, Marjorie H., Michael Carpenter, Loc Le, Linda A. LeBlanc, and Kristen Kellet. Using the Picture Exchange Communication System (PECS) With Children With Autism: Assessment of PECS Acquisition, Speech, Social-communicative Behavior, and Problem Behavior. 2002.

Charlop-Christy, Marjorie H., et al. Using the Picture Exchange Communication System (PECS) With Children With Autism: Assessment of PECS Acquisition, Speech, Social-communicative Behavior, and Problem Behavior. 2002.