@book{142218,
	author = {Needham, Christina W. and Morris, Betty C.},
	title = {Un modelo sistemático de enseñanza},
	publisher = {CEAC},
	year = {1978.},
	series = {Colección Educación y enseñanza : Serie monográfica},
	address = {Barcelona},
	note = {Translation of: A systems model approach to accountability.}
}