@book{5063,
	author = {Freedman, David and Pisani, Robert},
	title = {Estadística},
	publisher = {Antoni Bosch},
	year = {1993},
	address = {Barcelona :},
	edition = {2a. ed.},
	url = {https://www.biblioeco.unsa.edu.ar/pmb/images/libros/L128407.jpg}
}