@book{21345,
	author = {Olivos Rodríguez, Andrés Mauricio and Barrera Rodríguez, Cindy Johanna},
	title = {Opturando /},
	publisher = {Corporación Unificada Nacional de Educación Superior,},
	year = {2011.},
	address = {Bogotá (Colombia) :},
	edition = {                   }
}