Marcus Tullius Cicero (1855). “Cicero's Three books of offices, or moral duties: also his Cato Major, an essay on old age; Lælius, an essay on friendship; Paradoxes; Scipio's dream; and Letter to Quintus on the duties of a magistrate”, p.48
Marcus Tullius Cicero (1755). “M.T. Cicero, His Offices: Or, His Treatise Concerning the Moral Duties of Mankind; His Cato Major, Concerning the Means of Making Old Age Happy; His Laelius, Concerning Friendship; His Moral Paradoxes; The Vision of Scipio, Concerning a Future State; His Letter Concerning the Duties of a Magistrate. With Notes Historical and Explanatory”, p.53