(en) Joseph Haydn, The Book of Dignities: Containing Lists of the Official Personages of the British Empire ... from the Earliest Periods to the Present Time ... Together with the Sovereigns and Rulers of Europe, from the Foundation of Their Respective States; the Peerage of England and Great Britain Original 1851 Digitized by the University of Michigan, Longmans, Brown, Green, and Longmans, (lire en ligne), p. 279
