Reference for “OWL 2 Web Ontology Language:Primer”

@TechReport{Patel-Schneider:08:OWO,
  author      = "Peter F. Patel-Schneider and Bijan Parsia",
  title       = "{OWL} 2 Web Ontology Language:Primer",
  month       = apr,
  note        = "http://www.w3.org/TR/2008/WD-owl2-primer-20080411/",
  year        = "2008",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}