1. Anderson, C.: The Long Tail—How Endless Choice is Creating Unlimited Demand. Random House Business Book, New York (2006)
2. Arch, A.: Web Accessibility for Older Users: A Literature Review. W3c working draft, World Wide Web Consortium (W3C), Web Accessibility Initiative, MIT/CSAIL, Building 32-G530, 32 Vassar St, Cambridge, MA 02139, USA, May 2008a. http://www.w3.org/TR/2008/WD-wai-age-literature-20080514/
3. Arch, A.: Web accessibility for older users: A literature review. W3C. http://www.w3.org/TR/wai-age-literature (2008b)
4. Aula, A., Kaki, M.: Less is more in web search interfaces for older adults. First Monday (online), 7(10), July 2005. http://firstmonday.org/htbin/cgiwrap/bin/ojs/index.php/fm/issue/view/186
5. Brajnik, G.: Web accessibility testing: when the method is the culprit. In: Proceedings of ICCHP 2006 (2006)