@book{1097,
	author = {Samuelson, Paul A. and Nordhaus, William D.},
	title = {Economia},
	publisher = {McGraw-Hill},
	year = {1990},
	address = {México :},
	edition = {13a. ed.},
	url = {https://biblioeco.unsa.edu.ar/pmb/images/libros/Economia 13ed (samuelson-nordhaus).jpg.jpg}
}