Felix Sasaki. <a href="http://www.w3.org/TR/2006/WD-ltli-20060612"><cite>Language Tags and Locale Identifiers for the World Wide Web.</cite></a> 12 June 2006. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2006/WD-ltli-20060612">http://www.w3.org/TR/2006/WD-ltli-20060612</a>