Reference for “Implementing ATAG 2.0”

@TechReport{Spellman:09:IA,
  author      = "Jeanne Spellman and Jan Richards and Jutta Treviranus",
  title       = "Implementing {ATAG} 2.0",
  month       = oct,
  note        = "http://www.w3.org/TR/2009/WD-IMPLEMENTING-ATAG20-20091029/",
  year        = "2009",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}