@book{18289,
	author = {Bocanegra Barrero, Wilfren Sebastian  and Echeverria Rodriguez, Kevin Andres and   },
	title = {Grafibar / },
	publisher = {Corporación Unificada Nacional de Educación Superior,},
	year = {2018.},
	address = {Bogotá (Colombia) :},
	edition = {                   },
	url = {https://drive.google.com/open?id=1MKC81pbePX_RROShe-i33kV3MlA3_Pmt}
}