Using the Picture Exchange Communication System (PECS) With Children With Autism: Assessment of PECS Acquisition, Speech, Social-Communicative Behavior, and Problem Behavior
Charlop-Christy, M.; Carpenter, M.; Le, L.; LeBlanc, L.; Kellet, K.
, J Appl Behav Anal., Volume 35, Issue 3, p.213-231, (2002)
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