1. American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders (4th ed.). Washington, DC: Author.
2. Baranek, G. T. (1999) Autism during infancy: A retrospective video analysis of sensory motor and social behaviors at 9–12 months of age. Journal of Autism andDevelopmental Disorders, 29, 213–224.
3. Baron-Cohen, S., Cox, A., Baird, G., Sweettenham, J., & Nighingale, N. (1996). Psychological markers in the detection of autism in infancy in a large population. British Journal of Psychiatry, 168, 158–163.
4. Bettelheim, B. (1967). The emptyfortress: Infantile autism and the birth of the self. Oxford: Free Press of Glencoe.
5. Bijou, S. W., & Ghezzi, P. M. (1999). The behavior interference theory of autistic behavior in young children. In P. M. Ghezzi, W. L. Williams, & J. E. Carr (Eds.), Autism: Behavior analytic perspectives (pp. 33–43). Reno, NV: Context Press.