@book{21981,
	author = {Barreda, Gabino,},
	title = {La educación positivista en México /},
	publisher = {Porrúa },
	year = {1998.},
	series = {Sepan cuantos..;},
	address = {México},
	edition = {4a. ed.},
	note = {Incluye índice.}
}