@book{3819,
	author = {Samuelson, Paul A. and Nordhaus, William D.},
	title = {Economia},
	publisher = {McGraw-Hill},
	year = {1999},
	address = {Madrid :},
	edition = {16a. ed.},
	url = {https://www.biblioeco.unsa.edu.ar/pmb/images/libros/L126999.jpg}
}