Mary Wollstonecraft (1995). “Wollstonecraft: A Vindication of the Rights of Men and a Vindication of the Rights of Woman and Hints”, p.40, Cambridge University Press
Marcus Tullius Cicero (1856). “Cicero's 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”, p.249
Richard Isadore Evans, Carl Gustav Jung, Ernest Jones (1964). “Conversations with Carl [Gustav] Jung and reactions from Ernest Jones”, Princeton, N.J., Van Nostrand