References for John 1st Duke, 3rd Earl Sheffield * of Buckingham and Normanby * of Mulgrave

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Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
M.A.H., Marquis de Ruvigny: The Plantagenet roll of the blood royal, Essex Volume. London, Edinburgh, 1908
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
D.Schwennicke: Europäische Stammtafeln, Vol. III/2, Tafel 368. Marburg, 1983