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isbn incorrecte
* Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11a ed.). Cambridge University Press.
* Fraser, C. M. (1956). "Edward I of England and the Regalian Franchise of Durham". Speculum (Medieval Academy of America) 31 (2): 329–342. doi:10.2307/2849417. JSTOR 2849417.
* Harris, B. E. (ed.) (1979). The Victoria history of the county of Cheshire. Volume II. Londres: University of London Institute of Historical Research. ISBN 0197227499780197227497.
* Yates, Joseph Brooks (1856). The Rights and Jurisdiction of the County Palatine of Chester, the Earls Palatine, the Chamberlain, and Other Officers. Charles Simms & Co. pàg. 308. Consultat el 4 de maig del 2007.