@book{19439,
	author = { Cano Saavedra, Jonathan Stivents and Rey Romero, Manuel Ricardo },
	title = {Total Global System TGS / },
	publisher = {Corporación Unificada Nacional de Educación Superior,},
	year = {2020.},
	address = {Bogotá (Colombia) :},
	url = {https://drive.google.com/file/d/1AuogQHuDmoR2sjeUaWZBRhWK9FSgphZl/view?usp=sharing}
}