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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.239
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Marcus Tullius Cicero, James LOGAN (Chief Justice of the Province of Pennsylvania.) (1750). “Cato Major; Or, a Treatise on Old Age ... With Explanatory Notes from the Roman History. By Mr. Loggan [sic]. To which is Prefixed, the Life of Marcus Tullius Cicero”, p.42
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.245
Marcus Tullius Cicero, Pliny (2010). “Letters of Marcus Tullius Cicero with His Treatises on Friendship and Old Age; Letters of Pliny the Younger”, p.56, Cosimo, Inc.