References for Humphrey 1st Duke, 5th Earl, Comte Stafford * of Buckingham * of Stafford * de Perche

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Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966