John Milton (1824). “The Poetical Works of John Milton: With Notes of Various Authors, Principally from the Editions of Thomas Newton, Charles Dunster and Thomas Warton ; to which is Prefixed Newton's Life of Milton”, p.213
John Maynard Keynes (1929). “The Economic Consequences of the Peace: The classic text on the Treaty of Versailles and post war Europe”, p.141, Harriman House Limited