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- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [S801] John P. Ravilious, 5 Aug 2006, post to soc.genealogy.medieval.
- [S76] The Oxford Dictionary of National Biography. Oxford University Press, 2004-ongoing.
- [S802] Andrew B. W. MacEwen, "A Clarification of the Dunbar Pedigree." The Genealogist 9:229, Fall 1998.
- [S4445] Andrew B. W. MacEwen, "Seven Scottish Countesses, A Miscellany: III. Cristina de Brus, Countess of Dunbar." The Genealogist 17:223, Fall 2003., "liv. 1246".
- [S4445] Andrew B. W. MacEwen, "Seven Scottish Countesses, A Miscellany: III. Cristina de Brus, Countess of Dunbar." The Genealogist 17:223, Fall 2003.
- [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., correction in Volume 14, says "probably before 1208".
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