1. Cisco. 2012. http://newsroom.cisco.com/uk/press-release-content?articleId=888280&type=webcontent.
2. WAI. 2010. Web Accessibility Initiative. http://www.w3.org/WAI/.
3. W3C. 2012. World Wide Web Consortium. http://www.w3.org/.
4. ISO. 1947. International Organization for Standardization. http://www.iso.org/iso/home.html.
5. WCAG 2.0. 2008. Web Content Accessibility Guidelines 2.0. http://www.w3.org/TR/WCAG20/.