M. Tulli Ciceronis Cato Maior, De senectute liber / recensuit, praefatus est ... Atilius Barriera .. - Cicero, Marcus Tullius, 106-43 a.C. (OLS)http://pul/name/553; Barriera, Attilio, 1877-1931. (OLS)http://pul/name/6071 (G.B. Paravia & C., 1937)