@book{101622,
	author = {Johnson, David W., and Johnson, Roger T., and ebrary, Inc.},
	title = {The new circles of learning},
	publisher = {Association for Supervision and Curriculum Development,},
	year = {c1994.},
	address = {Alexandria, Va. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10379927}
}