@book{107411,
	author = {Cicerón, Marco Tulio, 106-43 a.C. and Valbuena, Manuel de M , 1821-},
	title = {Los oficios   },
	publisher = {: Espasa-Calpe},
	year = {, 1968},
	address = {Madrid},
	edition = {Cuarta edición},
	note = {Incluye índice}
}