1. Ahmed, Y., 2005. Focus on CSS. Available from: http://www.yehiaeg.com/focusoncss/desc.php.
2. Alexander, D., 2001. Web Blooper Report—Site: Spool. Available from: http://deyalexander.com/blooper/report.php?id=65.
3. User interface of a home page reader;Asakawa,1998
4. Auditory and tactile interfaces for representing the visual effects on the web;Asakawa,2002
5. Audiodata, 2004. WebFormator. Available from http://www.Webformator.com/index.html.