@book{22333,
	author = {Singer, Peter, 1946 and Prada, José Antonio de, tr.},
	title = {"Etica para vivir mejor /},
	publisher = {  Editorial Ariel},
	series = {"Ariel ; 139"},
	address = {Barcelona :},
	edition = {7a. edición.},
	note = {1 copia sala}
}