The Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom. 1887–98 (8 vols); 1910–59 (13 vols). 6 vols. Gloucester: Alan Sutton, 1982.
Oxford Dictionary of National Biography. 01/05/2005 (http://www.oxforddnb.com)
Richardson, Douglas. Plantagenet Ancestry. Salt Lake City, Utah: Genealogical Publishing Company, Inc., 2004.
