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- [S525] Antiquities of Shropshire, Vol. IX, by Robert William Eyton. London: John Russell Smith, 1859.
- [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.
- [S4445] Andrew B. W. MacEwen, "Seven Scottish Countesses, A Miscellany: III. Cristina de Brus, Countess of Dunbar." The Genealogist 17:223, Fall 2003.
- [S72] Chris Phillips, Some Corrections and Additions to The Complete Peerage.
- [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.
- [S845] J. Horace Round, Studies in Peerage and Family History. Westminster: Archibald Constable & Co Ltd, 1901.
- [S1016] Medieval English Ancestors of Robert Abell by Carl Boyer III. Santa Clarita, California, 2001.
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