Marc Langheinrich. <a href="http://www.w3.org/TR/2002/WD-P3P-preferences-20020415"><cite>A P3P Preference Exchange Language 1.0 (APPEL1.0).</cite></a> 15 April 2002. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2002/WD-P3P-preferences-20020415">http://www.w3.org/TR/2002/WD-P3P-preferences-20020415</a>