1. Kaplan and Sadock's Synopsis of Psychiatry: Behavioral Sciences, Clinical Psychiatry. Seventh Edition,;HI Kaplan,1994
2. Autism, schizophrenia, and allied disorders.;M Prior,1986
3. The Autistic Spectrum.;L Wing,1996
4. A neurochemical theory of autism.;J Panksepp;Trends Neurosci,1979
5. Possible brain opioid involvement in disrupted social intent and language development of autism.;J Panksepp,1987