1. Americans with Disabilities Act. US Public Law 101–336. Available online under http://www.dol.gov/esa/regs/statutes/ofccp/ada.htm
2. Arditi, A. Making Text Legible. Lighthouse International. Available online under http://www.lighthouse.org/print_leg.htm
3. Becker, S.A.: A study of web usability for older adults seeking online health resources. ACM. Trans. Comput. Hum. Interact. 11(4), 387–406 (2005)
4. Bernard, M.L.: Optimal web design: software usability Research Laboratory. Criteria for optimal web design. Available online under http://www.psychology.wichita.edu/optimalweb/older_adults.htm
5. Brouwer-Janse, M.D., Suri, J.F., Yawitz, M., de Vries, G., Fozard, J.L., Coleman, R.: User interfaces for young and old. Interactions 4(2), 34–36 (1997)