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References
Ali, E., McFarland, S. Z., & Umbreit, J. (2011). Effectiveness of
combining tangible symbols with the Picture Exchange
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with multiple disabilities, including visual impairment.
Education and Training in Autism and Developmental
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Ivy, S. E., Hatton, D. D., & Hooper, J. D. (2013). Using the Picture
Exchange Communication System with students with visual
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Parker, A.T., Banda, D. R., Davidson, R. & Liu-Gitz, L. (2010).
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