Reference for “PICS 1.1 Rating Services and Rating Systems -- and Their Machine Readable Descriptions”

@TechReport{Singer:09:PRS,
  author      = "David Singer and Paul Resnick and Jim Miller",
  title       = "{PICS} 1.1 Rating Services and Rating Systems -- and Their Machine Readable Descriptions",
  month       = nov,
  note        = "http://www.w3.org/TR/2009/REC-PICS-services-20091124",
  year        = "2009",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Recommendation",
  institution = "W3C",
}