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- [S76] The Oxford Dictionary of National Biography. Oxford University Press, 2004-ongoing.
- [S4343] Brice Clagett, 29 Dec 2004, 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.
- [S76] The Oxford Dictionary of National Biography. Oxford University Press, 2004-ongoing., year only.
- [S4345] Douglas Richardson, 27 Apr 2015, post to soc.genealogy.medieval.
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