@book{31,
	author = {Parkin, Michael and Esquivel, Gerardo},
	title = {Microeconomía},
	publisher = {Pearson Educación},
	year = {2001},
	address = {México :},
	edition = {5a. ed.},
	url = {https://biblioeco.unsa.edu.ar/pmb/images/libros/Microeconomia-l86515.jpg}
}