@book{9495,
	author = {Guba, Egon G. and Lincoln, Yvonna S.,},
	title = {Effective evaluation /},
	publisher = {Jossey-Bass Publishers,},
	year = {1981.},
	series = {A Joint publication in the Jossey-Bass higher education and Social and behavioral sciences series},
	address = {San Francisco :},
	edition = {1st ed.}
}