Jan Richards; Jutta Treviranus; Jeanne Spellman. <a href="http://www.w3.org/TR/2009/WD-ATAG20-20090217"><cite>Authoring Tool Accessibility Guidelines (ATAG) 2.0.</cite></a> 17 February 2009. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2009/WD-ATAG20-20090217">http://www.w3.org/TR/2009/WD-ATAG20-20090217</a>