1. DSM-IV, A.P.A.T.F.: DSM-IV: Diagnostic and statistical manual of mental disorders. American Psychiatric Association, Washington, DC (1994)
2. Rajendran, G., Mitchell, P.: Text Chat as a Tool for Referential Questioning in Asperger Syndrome. J. of Speech, Language, and Hearing Research 49, 102–112 (2006)
3. Schmidt, C., Schmidt, M.: Three-dimensional virtual learning environments for mediating social skills acquisition among individuals with autism spectrum disorders. In: IDC 2008: Proceedings of the 7th International Conference on Interaction Design and Children, pp. 85–88. ACM, New York (2008)
4. Parsons, S., Mitchell, P., Leonard, A.: The use and understanding of virtual environments by adolescents with autistic spectrum disorders. Journal of Autism and Developmental Disorders 34(4), 449–466 (2004)
5. Tartaro, A., Cassell, J.: Playing with virtual peers: bootstrapping contingent discourse in children with autism. In: ICLS 2008: Proceedings of the 8th International Conference for the Learning Sciences, pp. 382–389. International Society of the Learning Sciences (2008)