Links

http://en.wikipedia.org/wiki/William_de_Ferrers,_5th_Earl_of_Derby

http://www.mathematical.com/ferrerswilliam1200.html

http://www.thepeerage.com/p4268.htm

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Citations:

1. [S125] Richard Glanville-Brown, online <e-mail address>, Richard Glanville-Brown (RR 2, Milton, Ontario, Canada), downloaded 17 August 2005.

2. [S6] G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume II, page 48. Hereinafter cited as The Complete Peerage.

3. [S6] Cokayne, and others, The Complete Peerage, volume I, page 417.

4. [S6] Cokayne, and others, The Complete Peerage, volume II, page 128.