@book{1729,
	author = {GUTIERREZ CONTRERAS, FILIBERTO. and INSTITUTO TECNOLOGICO DE TUXTLA GUTIERREZ.},
	title = {EL ENFOQUE DE SISTEMAS EN LA INVESTIGACION  DE EXPECTATIVAS DE ATENCION EDUCATIVA/ },
	publisher = {EL AUTOR},
	year = {1987},
	address = {TUXTLA GUTIERREZ, CHIS.: }
}