@book{5069,
	author = {Walras, Léon and Segura, Julio},
	title = {Elementos de economía política pura (o teoría de la riqueza social)},
	publisher = {Alianza Editorial},
	year = {1987},
	address = {Madrid :},
	url = {https://www.biblioeco.unsa.edu.ar/pmb/images/libros/L128437.jpg}
}