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Michael Jones: Ferrers, Robert de, first Earl Ferrers (d. 1139). In: Henry Colin Gray Matthew, Brian Harrison (Hrsg.): Oxford Dictionary of National Biography, from the earliest times to the year 2000 (ODNB). Oxford University Press, Oxford 2004, ISBN 0-19-861411-X; doi:10.1093/ref:odnb/9365 (Lizenz erforderlich), Stand: 2004.
