Lincoln Castle (English Wikipedia)

Allen, Thomas (1833). The history of the county of Lincoln. London & Lincoln: John Saunders, Jr. p. 199. lincoln prison.
Colvin, H. M.; Brown, R. Allen; Taylor, A. J. (1963), The history of the King's Works Vol. 2: the Middle Ages, Her Majesty's Stationery Office, p. 704
Painter, Sydney (November 1949). "Review of books". The Journal of Economic History. 9 (2): 235–236. doi:10.1017/S0022050700063300. S2CID 154123313. Retrieved 15 May 2013. (reviewing Hill, J.W.F. (1948). Medieval Lincoln. Cambridge University Press.)

bbc.co.uk

Bradbury, Jim (1985). The medieval archer. Boydell & Brewer. p. 53. ISBN 0-85115-194-9.
Jaques, Tony (2007). Dictionary of Battles and Sieges. Greenwood Publishing Group. p. 588. ISBN 978-031333-538-9.{{cite book}}: CS1 maint: location missing publisher (link)

Painter, Sydney (November 1949). "Review of books". The Journal of Economic History. 9 (2): 235–236. doi:10.1017/S0022050700063300. S2CID 154123313. Retrieved 15 May 2013. (reviewing Hill, J.W.F. (1948). Medieval Lincoln. Cambridge University Press.)

Harfield, C. G. (1991), "A Hand-list of Castles Recorded in the Domesday Book", English Historical Review, 106 (419): 373, 380, 384, doi:10.1093/ehr/CVI.CCCCXIX.371, JSTOR 573107
Painter, Sydney (November 1949). "Review of books". The Journal of Economic History. 9 (2): 235–236. doi:10.1017/S0022050700063300. S2CID 154123313. Retrieved 15 May 2013. (reviewing Hill, J.W.F. (1948). Medieval Lincoln. Cambridge University Press.)

Holman, Dr Kathy. "Watling Street, the Danelaw and the East Midlands". Vikings in the East Midlands. Retrieved 9 September 2019.

Historic England. "Lincoln castle (326536)". Research records (formerly PastScape). Retrieved 3 May 2013.
Historic England. "Lincoln Roman Town Walls (326541)". Research records (formerly PastScape). Retrieved 9 September 2019.
Historic England. "Earthwork, 1144 (326634)". Research records (formerly PastScape). Retrieved 3 May 2013.
Historic England. "Battle of Lincoln 1217 (1393578)". Research records (formerly PastScape). Retrieved 3 May 2013.
Historic England. "Prison (1128351)". Research records (formerly PastScape). Retrieved 3 May 2013.
Historic England. "Eleanor cross fragment (326269)". Research records (formerly PastScape). Retrieved 3 May 2013.
Historic England. "Assize courts (1371045)". Research records (formerly PastScape). Retrieved 3 May 2013.
Historic England. "Medieval Fortifications (326634)". Research records (formerly PastScape). Retrieved 15 May 2013.
Historic England. "Thorngate Castle (1391209)". Research records (formerly PastScape). Retrieved 15 May 2013.

Harfield, C. G. (1991), "A Hand-list of Castles Recorded in the Domesday Book", English Historical Review, 106 (419): 373, 380, 384, doi:10.1093/ehr/CVI.CCCCXIX.371, JSTOR 573107

Painter, Sydney (November 1949). "Review of books". The Journal of Economic History. 9 (2): 235–236. doi:10.1017/S0022050700063300. S2CID 154123313. Retrieved 15 May 2013. (reviewing Hill, J.W.F. (1948). Medieval Lincoln. Cambridge University Press.)

"Crimes of Lincoln's past: Lincolnshire's final public execution". The Lincolnite. 28 April 2015. Retrieved 9 September 2019.
Santos, Cory (26 February 2013). "Searching for Lincoln's second castle". The Lincolnite. Retrieved 10 May 2013.

Sillem, R., ed. (1936). Records of Some Sessions of the Peace in Lincolnshire: 1360–1375. Publications of the Lincoln Record Society. Vol. XXX. Lincoln: Lincoln Record Society. p. lxxii. OCLC 29331375.