The Ragans Targeted Nutritional Intervention Site
- Includes parent testimonials and links to research articles.
- http://members.aol.com/TheRagans

Targeted Nutritional Intervention (TNI) in the Treatment of Children and Adults with Down Syndrome
- Scientific article explains the principles behind its use, and includes treatment protocols, and an expanded bibliography.
- http://www.lleichtman.org/tni.shtml

Cognitive Enhancement Research Institute
- Features articles and interviews about the use of vitamins and supplements in managing the condition.
- http://www.ceri.com/downhome.htm