Early intervention and AAC: What a difference 30 years makes.
Augmentative and Alternative Communication
September, 31(3), pp. 181-202.
Mapping the meanings of novel visual symbols by youth with moderate or severe mental retardation.
American Journal on Mental Retardation
100(4), pp. 391-402
Romski M. , Sevcik R. A. , Wilkinson K. (1994)
Peer-directed communicative interactions of augmented language learners with mental retardation.
American Journal on Mental Retardation
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