Complete Peerage, "Willoughby de Broke", Vol XII, part 2, pp. 683–701; see also Vol XIV for the descent through 1994; CP "Brooke of Beauchamps Court", Vol II, p. 331-2 for the special remainder of the barony of Brooke and the remark on the first Baron's grnadmother as "the greatest heiress of the age". For the dispute between Willoughby and Nevill over the title, see Vol VII, p 481 note (k); also T. C. Banks: Baronia Anglica concentrata; or, a concentrated account of all the baronies commonly called baronies in fee; deriving their origin from writ of summons, and not from any specific limited creation 1844, Vol I, p.277.
doi.org
Matthew, H. C. G.; Harrison, B., eds. (23 September 2004), "Willoughby family", The Oxford Dictionary of National Biography, Oxford: Oxford University Press, doi:10.1093/ref:odnb/52801, retrieved 16 August 2023
oxforddnb.com
Matthew, H. C. G.; Harrison, B., eds. (23 September 2004), "Willoughby family", The Oxford Dictionary of National Biography, Oxford: Oxford University Press, doi:10.1093/ref:odnb/52801, retrieved 16 August 2023
