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- [S142] Royal Ancestry: A Study in Colonial and Medieval Families by Douglas Richardson. Salt Lake City, 2013.
- [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.
- [S800] The Scots Peerage, Founded on Wood's Edition of Sir Robert Douglas's Peerage of Scotland, Containing an Historical and Genealogical Account of the Nobility of That Kingdom. Ed. James Balfour Paul. Edinburgh: David Douglas, 1904-1914.
- [S801] John P. Ravilious, 5 Aug 2006, post to soc.genealogy.medieval.
- [S802] Andrew B. W. MacEwen, "A Clarification of the Dunbar Pedigree." The Genealogist 9:229, Fall 1998.
- [S76] The Oxford Dictionary of National Biography. Oxford University Press, 2004-ongoing.
- [S801] John P. Ravilious, 5 Aug 2006, post to soc.genealogy.medieval., year only.
- [S4445] Andrew B. W. MacEwen, "Seven Scottish Countesses, A Miscellany: III. Cristina de Brus, Countess of Dunbar." The Genealogist 17:223, Fall 2003., year only.
- [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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