@book{21761,
	author = {Shakespeare, William},
	title = {Macbeth  },
	publisher = {Porrúa, },
	year = {2003},
	series = {Sepan cuantos; },
	address = {México  },
	edition = {17a ed.},
	note = {Incluye índice; Con notas preliminares y dos cronologías}
}