@book{71500,
	author = {Pirazán Orduz, Luis Germán,},
	title = {Clases, problemas y oportunidades /},
	publisher = {Editorial Oveja Negra,},
	year = {febrero 2015.},
	address = {Bogotá, Colombia :},
	edition = {1a edición.},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/37773/}
}