1. Act of 1990 (PL 101–336, 26 July 1990), 104 United States Statutes at Large;Americans with Disabilities,1990
2. Architectural and Transportation Barriers Compliance Board: Americans with Disabilities Act (ADA) accessibility guidelines for transportation vehicles, 36 Code of Federal Regulations Part 1192, Federal Register 56 (173), 1991.
3. Fulfilling America's promise to Americans with disabilities: new freedom initiative, 2001: http://www.whitehouse.gov/news/freedominitiative/freedominitiative.html Accessed July 20, 2006.
4. Disability statistics report—mobility device use in the United States;Kaye,2000
5. National Center for Statistics and Analysis, wheelchair users' injuries and deaths associated with motor vehicle related incidents: research note;National Highway Traffic Safety Administration,1997