G.E. Cokayne, The Complete Peerage of England, Scotland, Ireland, Great Britain ...

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G.E. Cokayne, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, volume 5 (The St. Catherine Press, London, 1926), page 683 (Internet Archive, accessed 11 June 2025; WikiTree's source page for Complete Peerage has links to online copies). "Robert FitzHamon, Lord of Creully in Calvados,... m. Sibyl, da. of Roger (de Montgomery), Earl of Shrewsbury, and had a da. Mabel, who m. Robert, the first Earl of Gloucester, son of Henry I."

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