@book{100562,
	author = {Masferrer, Alberto. and El Salvador. },
	title = {¿Qué debemos saber? },
	publisher = {Ministerio de Cultura, Departamento Editorial,},
	year = {1957.},
	series = {Biblioteca popular ; },
	address = {San Salvador : },
	edition = {[4ª ed.].}
}