@book{17531,
	author = {Lopez Vargas, Hernan Dario  and Castiblanco Rodriguez, Edwin Daniel      and   },
	title = {Telephoneservices /},
	publisher = {Corporación Unificada Nacional de Educación Superior,},
	year = {2018.},
	address = {Bogotá (Colombia) :},
	edition = {             },
	url = {https://drive.google.com/open?id=159oVVe20Arqi7O_d3dMwp8_DZqbxQsyO}
}