1. Look and understand before you leap.;Abery;Impact,1998
2. Adler , M.C. Hendershot , G.E. 2000 Proceedings of the Survey Research Methods Section, American Statistical Association. http://www.amstat.org/Sections/Srms/Proceedings/papers/2000_014.pdf
3. Americans with Disabilities Act of 1990, 42 U. S. C. A. 1990
4. The modified CAMDEX informant interview is a valid and reliable tool for use in the diagnosis of dementia in adults with Down's syndrome.;Ball;Journal of Intellectual Disability Research,2004