Reference for “OWL 2 Web Ontology Language Primer”

@TechReport{9132314,
  author      = "Markus Kr{\"{o}}tzsch and Peter F. Patel-Schneider and Sebastian Rudolph and Pascal Hitzler and Bijan Parsia",
  title       = "{OWL} 2 Web Ontology Language Primer",
  month       = oct,
  note        = "http://www.w3.org/TR/2009/REC-owl2-primer-20091027/",
  year        = "2009",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "",
  institution = "W3C",
}