"International Systems: Peace, Conflict Resolution, and Politics" (1975) by Kenneth Boulding (p. 375), as quoted in "Non-offensive defence for the twenty-first century" by Bjørn Møller, Håkan Wiberg, (p. 36), 1994.
duc de François La Rochefoucauld, François La Rochefoucauld (duc de), King of Poland Stanisław, Stanisław I Leszczyński (King of Poland) (1851). “Moral reflections, sentences and maxims of Francis, duc de la Rochefoucauld”, p.178