Daniel C. Burnett; Mark R. Walker; Andrew Hunt. <a href="http://www.w3.org/TR/2004/REC-speech-synthesis-20040907"><cite>Speech Synthesis Markup Language (SSML) Version 1.0.</cite></a> 7 September 2004. W3C Recommendation. URL: <a href="http://www.w3.org/TR/2004/REC-speech-synthesis-20040907">http://www.w3.org/TR/2004/REC-speech-synthesis-20040907</a>