Paolo Baggia. <a href="http://www.w3.org/TR/2008/REC-pronunciation-lexicon-20081014"><cite>Pronunciation Lexicon Specification (PLS) Version 1.0.</cite></a> 14 October 2008. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2008/REC-pronunciation-lexicon-20081014">http://www.w3.org/TR/2008/REC-pronunciation-lexicon-20081014</a>