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- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [S1211] A History of Northumberland in Three Parts, Part II, Vol. III by John Hodgson. Newcastle: 1840.
- [S438] Douglas Richardson, 11 Aug 2018, post to soc.genealogy.medieval.
- [S2147] George Grazebrook, "Descent in the Male Line of the Family of Grazebrook from 1065, with Proofs for each Generation." Miscellanea Genealogica et Heraldica series 4, volume 3 (1910), pages 106, 198, 254.
- [S434] Paul C. Reed, 2 Aug 2000, three-part post to soc.genealogy.medieval.
- [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.
- [S1016] Medieval English Ancestors of Robert Abell by Carl Boyer III. Santa Clarita, California, 2001.
- [S7287] Women in Thirteenth-Century Lincolnshire by Louise J. Wilkinson. Woodbridge, Suffolk: A Royal Historical Society Publication, published by the Boydell Press, 2007.
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