@book{83275,
	author = {Covilla Martinez, Juan Carlos,},
	title = {¿Unitaria o federal? :},
	publisher = {Universidad Externado de Colombia,},
	year = {[2015]},
	address = {Bogotá :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/68621/}
}