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2. Basil, C. (1994). Family involvement in the intervention process. En J. Brodin y E. Njürck-AkessonMethodological issues in research in augmentative and alternative communication. Jünküping: Jünküping University Press
3. Supporting graphic language acquisition by a girl with multiple impairments;Basil,1996
4. Early social interaction and language acquisition;Bruner,1977