1. Michael BF, Harold AP, Allen F, Ruth R, Nancy E, Wendy w et al. Pervasive developmental disorders, DSM IV-Diagnostic and Statistical manual of mental disorders. American Psychiatric Association, 4 th ed. 2000. New Delhi: Jaypee brothers medical publishers; 2005. p. 59-61.
2. Davidovitch M1, Glick L, Holtzman G, Tirosh E, Safir MP. Developmental regression in autism: Maternal perception. J Autism Dev Disord 2000;30:113-9. Open Available from: http://link.springer.com/article/10.1023/A: 1005403421141. [Last accessed on 2012 July 02].
3. Russell G. The Rise and Rise of the Autism Diagnosis, Autism-Open Access, Available from: http://www.omicsgroup.org/journals/2165-7890/2165-7890-2-e104.pdf. [Last accessed on 2012 July 02].
4. Action for autism, national centre for Autism. Available from: http://www.autism-india.org/afa_autisminindia.html. [Last accessed on 2012 July 02].