@book{14489,
	author = {Ortiz García, Angel Luis.},
	title = {La enseñanza de los estudios sociales en la escuela elemental},
	publisher = {Editorial Universitaria, Universidad de Puerto Rico},
	year = {1981.},
	address = {Río Piedras},
	edition = {5. ed. rev. y aum.},
	note = {Also avaialble in General Collection.}
}