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== Bibliographia ==
* David Crouch, ''William Marshal: Knighthood, War and Chivalry, 1147–1219''. 2a ed. Londinii: Longman, 2002
* David Crouch, "Marshal, William (I), fourth earl of Pembroke (c.1146–1219)" in ''[[Oxford Dictionary of National Biography]]'' (Oxonii: Oxford University Press, 2004) [http://www.oxforddnb.com.ezproxy.londonlibrary.co.uk/view/article/18126 Situs venalis]{{ODNB}}
* [[Georgius Duby|Georges Duby]], ''Guillaume le Maréchal ou le meilleur chevalier du monde''. Lutetiae: Fayard, 1984. ISBN 2-07-032344-7
* Hamilton Hall, "The Marshal Pedigree" in ''Journal of the Royal Society of Antiquaries of Ireland'' 6a ser. vol. 3 (1913) pp. 1-29