Kevin Smith. <a href="http://www.w3.org/TR/2007/WD-dial-20070727"><cite>Device Independent Authoring Language (DIAL).</cite></a> 27 July 2007. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2007/WD-dial-20070727">http://www.w3.org/TR/2007/WD-dial-20070727</a>