@book{48366,
	author = {Poundstone, William, and Brotons Muñoz, Alfredo,},
	title = {Carl Sagan :},
	publisher = {Akal,},
	year = {[2017]},
	series = {Akal/Biografías ;},
	address = {Tres Cantos, Madrid, España :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/50917/}
}