@book{69,
	author = {Baca Urbina, Gabriel and Vergara Nava, Leonardo},
	title = {Evaluación de proyectos},
	publisher = {McGraw-Hill},
	year = {1990},
	address = {México :},
	edition = {2a. ed.},
	url = {https://biblioeco.unsa.edu.ar/pmb/images/libros/Evaluaci?n de Proyectos(2a edi).jpg}
}