1. American Foundation for the Blind.:
http://www.afb.org/
(2007). Accessed 18 July 2007
2. Alabama Institute for the Deaf and Blind.:
http://www.aidb.org/
(2007). Accessed 18 July 2007
3. Automark Voter Assist Terminal.:
http://www.automarkts.com/
(2007). Accessed 18 July 2007
4. CMU Sphinx Recognition Engine.:
http://www.cmusphinx.sourceforge.net/html/cmusphinx.php
(2008). Accessed 30 June 2008
5. Cross, E.V., Rogers, G., McClendon, J., Mitchell, W., Rouse, K., Gupta, P., Williams, P., Mkpong-Ruffin, I., McMillian, Y., Neely, E., Lane, J., Blunt, H., Gilbert, J.E.: Prime III: one machine, one vote for everyone. VoComp 2007, Portland, OR. 16–18 July 2007