Markus Mielke; Alex Mogilevsky. <a href="http://www.w3.org/TR/2007/WD-css3-grid-20070905"><cite>CSS Grid Positioning Module Level 3.</cite></a> 5 September 2007. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2007/WD-css3-grid-20070905">http://www.w3.org/TR/2007/WD-css3-grid-20070905</a>