- NICHD Autism Site - National Institute of Child Health and Human Development
- Autism - National Institute of Neurological Disorders and Stroke
- Autism - National Institute of Neurological Disorders and Stroke
- Autism Facts - National Institute of Child Health and Human Development
- Autism Spectrum Disorders (Pervasive Developmental - National Institute of Mental Health
- Autism - National Center on Birth Defects and Developmental Disabilities
- Autism - National Institute of Neurological Disorders and Stroke
- Autism Overview: What We Know - National Institute of Child Health and Human Development
- Facts about Autism - National Institute of Child Health and Human Development
- Autism - Mayo Foundation for Medical Education and Research
- Learn the Signs. Act Early - National Center on Birth Defects and Developmental Disabilities