@book{87730,
	author = {Isac, Juan José,},
	title = {Todo sobre el universo :},
	publisher = {Liber Factory,},
	year = {[2014]},
	address = {Madrid, España :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/87856/}
}