@book{144231,
	author = {Sierra, Justo, },
	title = {Manual escolar de Historia general / },
	publisher = {Secretaría de Educación Pública, },
	year = {1924.},
	address = {México : },
	edition = {4ª. ed.},
	url = {http://bdh-rd.bne.es/viewer.vm?id=0000129704&page=1 }
}