Marcus Tullius Cicero (1857). “Cicero's Three Books of Offices: Or Moral Duties; Also His Cato Major ... Laelius ... Paradoxes; Scipio's Dream; and Letter to Quintus on the Duties of a Magistrate. Literally Tr., with Notes ...”, p.311
Marcus Tullius Cicero, Cyrus R. Edmonds (1863). “Three Books of Offices; Or, Moral Duties: Also His Cato Major, an Essay on Old Age; Laelius, an Essay on Friendship; Paradoxes; Scipio's Dream; and Letter to Quintus on the Duties of a Magistrate. Literally Translated, with Notes, Designed to Exhibit a Comparative View of the Opinions of Cicero, and Those of Modern Moralists and Ethical Philosophers”, p.44