@book{45708,
	author = {Editorial Molino -Barcelona},
	title = {Cómo y por qué},
	publisher = {Editorial Molino - Barcelona},
	year = {1968},
	series = {Comó y por qué},
	address = {España :},
	note = {Titulo original: Our Earth},
	url = {http://biblioteca.unac.edu.co/portadas/14923.jpg}
}