Michael Cooper; Richard Schwerdtfeger; Lisa Pappas. <a href="http://www.w3.org/TR/2009/WD-wai-aria-practices-20090224"><cite>WAI-ARIA Best Practices.</cite></a> 24 February 2009. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2009/WD-wai-aria-practices-20090224">http://www.w3.org/TR/2009/WD-wai-aria-practices-20090224</a>