Reference for “Techniques for WCAG 2.0”

@TechReport{Vanderheiden:08:TW,
  author      = "Gregg Vanderheiden and Michael Cooper and Ben Caldwell and Loretta Guarino Reid",
  title       = "Techniques for {WCAG} 2.0",
  month       = apr,
  note        = "http://www.w3.org/TR/2008/WD-WCAG20-TECHS-20080430/",
  year        = "2008",
  bibsource   = "http://webcapita.com/w3c-bibliography/2008/WD-WCAG20-TECHS-20080430/",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}