Links:

NDSS
http://www.ndss.org/content.cfm?fuseaction=InfoResHlthArticle&article=204

Autism and Down Syndrome Abstracts:
http://www.altonweb.com/cs/downsyndrome/index.htm?page=autismab.html

Pamphlet on Developmentally Disabled and Dual Diagnosis
http://www.uwec.edu/ce/devedisa/brochure.pdf

Kennedy Krieger Institute
http://www.kennedykrieger.org/kki_misc.jsp?pid=2142

Down Syndrome and Autism Spectrum Disorder
http://www.dsmig.org.uk/library/articles/autism-notes.html

Disability Solutions: Down Syndrome and Autism Spectrum Disorder
http://www.disabilitysolutions.org/3-5.htm