@book{264808,
	author = {Langer, Georgea M., and Colton, Amy B.,},
	title = {Collaborative analysis of student work :},
	publisher = {Association for Supervision and Curriculum Development,},
	year = {c2003.},
	address = {Alexandria, Va. :},
	url = {http://www.loc.gov/catdir/toc/ecip044/2003011032.html}
}