Roland Merrick; Rhys Lewis. <a href="http://www.w3.org/TR/2007/WD-cselection-primer-20070109"><cite>Content Selection Primer 1.0.</cite></a> 9 January 2007. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2007/WD-cselection-primer-20070109">http://www.w3.org/TR/2007/WD-cselection-primer-20070109</a>