@book{95386,
	author = {Campbell, Donald F. and Stanley, Julián C.},
	title = {Diseños experimentales y cuasiexperimentales en la investigación social},
	publisher = {Amorrortu,},
	year = {1973},
	series = {Biblioteca de Sociología},
	address = {Buenos Aires :},
	note = {Traducción de : Experimental and quasi-experimental designs for research}
}