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C. P. Lewis, "Warenne, William (I) de, first earl of Surrey (d. 1088)" (Oxford, UK: OUP, 2004) Retrieved 6 April 2017.^ Jump up to:a b c d K. S. B. Keats-Rohan, "Aspects of Torigny's Genealogy Revisited", Nottingham Medieval Studies 37:21–27Jump up^Lewis C. Loyd, "The Origins of the Family of Warenne", Yorkshire Archaeological Journal, 31:97–113 |