Accessible Society Action Project http://www.accessiblesociety.org/index.shtml  

The Center for Universal Design. http://www.design.ncsu.edu/cud/  

Covington, G. and Hannah, B. 1997. Access by Design. Van Nostrand Reinhold, New York.  

Pirkl, J.1994. Transgenerational Design : Products for an Aging Population. Van Nostrand Reinhold, New York.  

Trace Research & Development Center - http://www.trace.wisc.edu/tindex.html 

"Unlimited By Design." Cooper-Hewitt, National Design Museum, Smithsonian Institution. http://www.si.edu/ndm/exhib/unlimited/home.htm