^Jim Bradbury (2005), Stephen and Matilda: The Civil War of 1139-53 (بالإنجليزية), The History Press, pp. vii, QID:Q106410573
^R. Allen Brown; Michael Prestwich; Charles Coulson (1980). Castles: A History and Guide (بالإنجليزية). Poole: Blandford Press. p. 10. ISBN:0-7137-1100-0. OL:3828609M. QID:Q46137661.