@book{44048,
	author = {Wittgenstein, Ludwig and Gracia Guillen, Francisco},
	title = {Los cuadernos azul y marrón / },
	publisher = {Editorial Tecnos , },
	year = {1968.},
	series = {Estructura y función.},
	address = {Madrid : },
	note = {Incluye índice. }
}