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- [S874] Todd A. Farmerie, "Robert de Torigny and the family of Gunnor, Duchess of Normandy.".
- [S1203] Baddesley Clinton: Its Manor, Church, and Hall by Henry Norris. London: Art and Book, 1897.
- [S128] The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant ed. Vicary Gibbs, H. A. Doubleday, Duncan Warrand, Howard de Walden, Geoffrey H. White and R. S. Lea. 2nd edition. 14 volumes (1-13, but volume 12 spanned two books), London, The St. Catherine Press, 1910-1959. Volume 14, "Addenda & Corrigenda," ed. Peter W. Hammond, Gloucestershire, Sutton Publishing, 1998.
- [S775] Powys-Lybbe Ancestry, by Tim Powys-Lybbe.
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