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, JSTOR573107
Historic England. "Lincoln castle (326536)"[1]. Research records (formerly PastScape). Retrieved 3 May 2013.
Historic England. "Eleanor cross fragment (326269)"[3]. Research records (formerly PastScape). Retrieved 3 May 2013.
historicengland.org.uk
Historic England. "Lincoln Castle (Grade Scheduled) (1005049)"[2]. National Heritage List for England. Retrieved 3 May 2013
jstor.org
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, JSTOR573107
lincolncastle.com
Victorian Prison, Lincoln Castle website. Retrieved 19 March 2016.