References for Ralph Earl, Earl, Earl de Monthermer * of Atholl * of Gloucester * of Hertford

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
J. Dupont, J. Saillot: Cahiers de Saint-Louis. Nantes, Angers, 1976 etc.
W.K. v.Isenburg: Europäische Stammtafeln, Band II, Tafel 60. Marburg, 1953 (1965)
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
D.Schwennicke: Europäische Stammtafeln, Vol. II, Tafel 84. Marburg, 1984