1. Closing the Gap A National Blueprint to Improve the Health of Persons with Mental Retardation-Report of the Surgeon General's Conference on Health Disparities and Mental Retardation http://www.nichd.nih.gov/publications/pubs/closingthegap/ 2010
2. Pediatric assessment of the child with developmental delay;Levy;Pediatr Clin North Am,1993
3. The epidemiology of mental retardation: challenges and opportunities in the new millennium;Leonard;Mental Retardation and Developmental Disabilities Research Reviews,2002
4. World Health Organization Ageing and Intellectual Disabilities - Improving Longevity and Promoting Healthy Ageing: Summative Report http://www.who.int/mental health/media/en/20.pdf 2010