AAIDD / / AAIDD Beukelman, D. / 1988 / Communication options for who cannot speak: Assessment and evaluation / Proceedings of the National Planners Conference on Assistive Device Service Delivery Beukelman, D. / 2005 / Augmentative and alternative communication. Management of severe communication disorders in children and adults / Baltimore: Paul H. Books Publishing Co Brady, N. C. / 1995 / Initiation and repair of intentional communication acts by adults with severe to profound cognitive disabilities / Journal of Speech and Hearing Resear Bruner, J / 1981 / The social context of language acquisition / Language and Communication 1 : 155 ~ 178