Roger Gimson. <a href="http://www.w3.org/TR/2003/NOTE-di-princ-20030901"><cite>Device Independence Principles.</cite></a> 1 September 2003. W3C Note. URL: <a href="http://www.w3.org/TR/2003/NOTE-di-princ-20030901">http://www.w3.org/TR/2003/NOTE-di-princ-20030901</a>