@book{9674,
	author = {Aybar, Ignacio},
	title = {Sociedad 4 ; educación média :},
	publisher = {Santillana,},
	year = {2001.},
	series = {Umbral},
	address = {Santo Domingo :},
	note = {Sociedad 4.  Cuarto de bachillerato .  2do. curso / Segundo ciclo}
}