^Reeve, Michael D., ed (2007). Geoffrey of Monmouth. The history of the kings of Britain: an edition and translation of De gestis Britonum (Historia regum Britanniae). Arthurian studies. 69. Woodbridge, Suffolk: Boydell Press. ISBN978-1-84383-206-5
^Plea Rolls of the Court of Common Pleas; National Archives; CP 40/541. Year 1396; third entry.[リンク切れ]
^“History”. Guildhall (25 August 2019). 14 November 2020閲覧。