@book{137693,
	author = {Stahl, Gerry. and ebrary, Inc.},
	title = {Group cognition},
	publisher = {MIT Press,},
	year = {c2006.},
	series = {Acting with technology},
	address = {Cambridge, Mass. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10173677}
}