@book{111,
	author = {Las Heras, José María},
	title = {Estado eficaz},
	publisher = {Osmar D. Buyatti},
	year = {2006},
	address = {Buenos Aires :},
	edition = {2a. ed},
	url = {https://biblioeco.unsa.edu.ar/pmb/images/libros/estado_eficaz.jpg}
}