Oscar Wilde (2014). “Wilde Complete Plays: Lady Windermere's Fan; An Ideal Husband; The Importance of Being Earnest; A Woman of No Importance; Salome; The Duchess of Padua; Vera, or the Nihilists; A Florentine Tragedy; La Sainte Courtisane”, p.557, Bloomsbury Publishing
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.50