Reference for “CSS basic box model”

@TechReport{Bos:07:C,
  author      = "Bert Bos",
  title       = "{CSS} basic box model",
  month       = aug,
  note        = "http://www.w3.org/TR/2007/WD-css3-box-20070809",
  year        = "2007",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}