References for Robert 4th Earl FitzPernel * of Leicester

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
D.Schwennicke: Europäische Stammtafeln, Vol. III/4, Tafel 700. Marburg, 1989