@book{2378,
	author = {Samuelson, Paul A. and Nordhaus, William D.},
	title = {Economia},
	publisher = {McGraw-Hill},
	year = {2010},
	address = {México :},
	edition = {19a. ed.},
	url = {https://biblioeco.unsa.edu.ar/pmb/images/libros/economia.jpg}
}