G.E. Cokayne - rev. ed. V. Gibbs, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, II, Londen, 1912, p. 359.
google.be
books.google.be
Annales Monasterii de Oseneia (a.d. 1016-1347). Chronicon Vulgo Dictum Chronicon Thomae Wykes (a.d. 1066-1289). Annales Prioratus de Wigornia (a.d. 1-1377), IV, Londen, 1869, p. 72. Gearchiveerd op 8 augustus 2023.
web.archive.org
Annales Monasterii de Oseneia (a.d. 1016-1347). Chronicon Vulgo Dictum Chronicon Thomae Wykes (a.d. 1066-1289). Annales Prioratus de Wigornia (a.d. 1-1377), IV, Londen, 1869, p. 72. Gearchiveerd op 8 augustus 2023.
wikisource.org
nl.wikisource.org
T.A. Archer, art. Clare, Gilbert de (d.1230), in Dictionary of National Biography 10 (1887), p. 378.
