Francis Thackeray, William Pitt (1827). “A history of the Right Honorable William Pitt, Earl of Chatham: containing his speeches in Parliament : a considerable portion of his correspondence, when Secretary of State, upon French, Spanish, and American affairs, never before published with an account of the principal events and persons of his time, connected with his life, sentiments and administrations ; (Mit dem Bildnisse Pitts)”, p.327
William Pitt (1st earl of Chatham.) (1839). “Correspondence, ed. by [W.S. Taylor and J.H. Pringle] the executors of his son John, earl of Chatham”, p.387