@book{8199,
	author = {Ciceron, Marco Tulio and Peñalosa, Joaquín Antonio},
	title = {Los oficios o los deberes  },
	publisher = {Porrúa , },
	year = {1990},
	series = {Sepan cuantos ; },
	address = {México  },
	edition = {7a ed.},
	note = {Incluye índice}
}