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Bondy, A., & Frost, L. (2013). Talking with pictures? Using PECS to teach functional language skills. In W. L. Heward, Exceptional children: An introduction to special education (10th ed.) (pp. 302-303). Upper Saddle River, NJ: Pearson.

Exceptional children: An introduction to special education (10th ed.) (pp. 302-303). Upper Saddle River, NJ: Pearson.

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