1. Autism: recognition, referral and diagnosis of children and young people on the autism spectrum;National Institute of Health and Clinical Excellence,2011
2. Diagnostic and statistical manual of mental disorders;American Psychiatric Association,2000
3. The ICD-10 classification of mental and behavioural disorders;World Health Organisation,1993
4. American Psychiatric Association DSM-5 Development. www.dsm5.org.
5. Assessment, diagnosis and clinical interventions for children and young people with autism spectrum disorders;Scottish Intercollegiate Guidelines Network,2007