@book{215848,
	author = {Waxman, Hersholt C. and ebrary, Inc.},
	title = {Observational research in U.S. classrooms},
	publisher = {Cambridge University Press,},
	year = {2004.},
	address = {Cambridge, UK ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10120472}
}