Reference for “Voice Extensible Markup Language (VoiceXML) 2.1”

@TechReport{Oshry:07:VEM,
  author      = "Matt Oshry and Michael Bodell and Paolo Baggia and Daniel C. Burnett and Alex Lee and David Burke and Jerry Carter and Emily Candell and RJ Auburn and Brad Porter and Ken Rehor and Scott McGlashan",
  title       = "Voice Extensible Markup Language ({VoiceXML}) {2.1}",
  month       = jun,
  note        = "http://www.w3.org/TR/2007/REC-voicexml21-20070619/",
  year        = "2007",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Recommendation",
  institution = "W3C",
}