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van der Meer, L., Sutherland, D., O'Reilly, M.F., Lancioni, G.E. & Sigafoos, J. (2012). A Further Comparison of Manual Signing, Picture Exchange, and Speech-Generating Devices as Communication Modes for Children with Autism Spectrum Disorders. Research in Autism Spectrum Disorders, 6(4), 1247-1257.