| <1> | SNY9152 - Report: Northern Archaeological Associates. 12/2002. The Cockpit, Richmond Castle Archaeological Evaluation and Watching Brief report. Abramson, P; Parry, J. 2003/03/10. |
| <2> | SNY9540 - Monograph: English Heritage. 2001. Conservation Plan Richmond Castle Volume I - Understanding the Site. Grenville, J; Harkrader, N; Clark, J; (Cont). |
| <3> | SNY9541 - Monograph: English Heritage. 2001. Conservation Plan Richmond Castle Volume II - Statement of Significance & Conservation Policies. Grenville, J; Harkrader, N; Clark, J; (Cont). |
| <4> | SNY9542 - Monograph: English Heritage. 2001. Conservation Plan Richmond Castle Volume III - Gazeteer. Grenville, J; Harkrader, N; Clark, J; (Cont). |
| <5> | SNY1613 - Article: Yorkshire Archaeological Journal. 1913. CASTLES OF THE NORTH RIDING. I'ANSON W M. Photocopy. p 374 - 376 |
| <6> | SNY12690 - Guide: English Heritage. 2001. Richomnd Castle Easby Abbey. Goodall, J. |