@book{23439,
	author = {Blalock, Hubert M., and Wolfson, Leandro,},
	title = {Introducción a la investigación social /},
	publisher = {Amorrortu,},
	year = {1970.},
	series = {Biblioteca de sociología},
	address = {México :},
	note = {Indice índice}
}