By Heller Kathryn Wolff   Gallagher Peggy A   Fredrick Laura D   in Association for the Severely Handicapped. Journal (JASH)

ISSN:0274-9483|24|1|33-43

TASH Publishing‎(1999)‎

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By Heller Kathryn Wolff   Allgood Margaret   Davis Bobby   Arnold Susan   Castelle Melanie   Taber Teresa   in Augmentative & Alternative Communication

ISSN:0743-4618|12|3|169-180

Informa Healthcare‎(1996)‎

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