@book{16831,
	author = {Johnson, David W., and Johnson, Roger T.,},
	title = {Cooperative learning :},
	publisher = {School of Education and Human Development, George Washington University,},
	year = {1991.},
	series = {ASHE-ERIC higher education report,},
	address = {Washington, DC :},
	note = {"Prepared by ERIC, Clearinghouse on Higher Education, the George Washington University in cooperation with ASHE, Association for the study of Higher Education."}
}