1. Bailey, D. B. & Simeonsson, R. J. (1988). Family assessment in early intervention. London: Merrill Publishing Company.
2. Early Intervention and the Assessment of Developmental Skills: Challenges and Directions
3. Beukelman, D. & Mirenda, P. (1992). Augmentative and Alterna-tive Communication. New York: Paul H. Brookes.
4. Bjorck-Akesson, E. (1992b). Samspel mellan sma barn med rdrelsehinderoch talhandikapp och deras föräldrar - en longi-tudinell studie [Interactive communication between small chil-dren with motor disability and speech impairment and their parents]. Goteborg: ACTA Universitatis Gothenburgensis.