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The Picture Exchange Communication System

The Picture Exchange Communication System, Bondy, A., and Frost L. , Augmentative & Alternative Communication , Volume 25, Issue 5, p.725-744, (2001)
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Comparison of PECS and the use of a VOCA: A Replication

Comparison of PECS and the use of a VOCA: A Replication, Beck, A. R., Stoner J. B., Bock S. J., and Parton T. , Education and Training in Developmental Disabilities , Volume 43, Issue 2, p.198-216, (2008)
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