"Combined Fire Authority". Durham and Darlington Fire and Rescue Authority. 25 February 2009. Archived from the original on 13 May 2011. Retrieved 18 April 2009.
doi.org
Scammell, Jean (1966). "The Origin and Limitations of the Liberty of Durham". The English Historical Review. 81 (320): 449–473. doi:10.1093/ehr/LXXXI.CCCXX.449. JSTOR561658.
Warren, W. L. (1984). "The Myth of Norman Administrative Efficiency: The Prothero Lecture". Transactions of the Royal Historical Society. 34: 113–132. doi:10.2307/3679128. JSTOR3679128. S2CID162793914.
Scammell, Jean (1966). "The Origin and Limitations of the Liberty of Durham". The English Historical Review. 81 (320): 449–473. doi:10.1093/ehr/LXXXI.CCCXX.449. JSTOR561658.
Warren, W. L. (1984). "The Myth of Norman Administrative Efficiency: The Prothero Lecture". Transactions of the Royal Historical Society. 34: 113–132. doi:10.2307/3679128. JSTOR3679128. S2CID162793914.
Warren, W. L. (1984). "The Myth of Norman Administrative Efficiency: The Prothero Lecture". Transactions of the Royal Historical Society. 34: 113–132. doi:10.2307/3679128. JSTOR3679128. S2CID162793914.
"Combined Fire Authority". Durham and Darlington Fire and Rescue Authority. 25 February 2009. Archived from the original on 13 May 2011. Retrieved 18 April 2009.