Selection of references used:
- 1: Various, The Cistercian Abbeys of Britain, 1998, ISBN:0-7134-8392-X, B.T.Batsford Ltd (1998)
- 2: Jasper Ridley, The History of England, 1981, ISBN:0-7100-0794-9, Routledge & Kegan Paul (1981)
- 3: Magnus Magnusson, Vikings!
- 4: G.W.S Barrow, Feudal Britain, 1967
- 5: John Harvey, The Plantagenets
- 6: John Kinross, Discovering Castles in England and Wales, Shire Publications Ltd
- 7: The Anglo-Saxon Chronicle
- 8: Maurice Ashley, The Life and Times of King John
- 9: Elizabeth Luckock and Caroline Gundy, Simon de Montfort, 1969, ISBN:08-008236-6, A. Wheaton & Co (1969), Erdington Library
- 10: M.T.Clanchy, England and its Rulers