@book{2960,
	author = {CAMPBELL, DONALD T. and STANLEY, JULIAN C.},
	title = {DISEÑOS EXPERIMENTALES Y   CUASIEXPERIMENTALES EN LA INVESTIGACION   SOCIAL/ },
	publisher = {AMORRORTU},
	year = {1973},
	address = {ARGENTINA: },
	note = {BIBLIOGRAFIA: P. 140-152.}
}