1. U.S. Census Bureau: American Community Survey. Disability Characteristics, 2009–2013 American Community Survey 5-year Estimates (2013).
http://factfinder.census.gov/
2. Brault, M.W.: Americans with Disabilities: 2010. U.S. Census Bureau, Washington, DC (2012).
https://www.census.gov/prod/2012pubs/p70-131.pdf
3. Help America Vote Act of 2002, Pub. L. No. 107-252, 116 Stat. 1666-1730, codified at 42 U.S.C. §§15301–15545 (2002)
4. Bovbjerg, B.: Voters with Disabilities: Challenges to Voting Accessibility. U.S. Government Accountability Office, Washington, D.C. (2013)
5. Swierenga, S.J., Pierce, G.L.: Testing usability performance of accessible voting systems: final report. Technical report, Michigan State University, Usability/Accessibility Research and Consulting, East Lansing, MI (2012)