Barley 1976, p. 76. Barley, M. W. (1976). "Town Defences in England and Wales After 1066". In Barley, M. W. (ed.). The Plans and Topography of Medieval Towns in England and Wales (Report). CBA Report 14. York: Council for British Archaeology. doi:10.5284/1081808 – via Archaeology Data Service.
Morris 1901, pp. 171–172. Morris, John Edward (1901). The Welsh Wars of Edward I: a Contribution to Medieval Military History Based on Original Documents. Oxford: Clarendon Press. hdl:2027/mdp.39015066410104.
Breeze 1999, pp. 173–174. Breeze, Andrew (1999). "Cefnllys and the Hereford Map". The Radnorshire Society Transactions. 69: 173–175. Archived from the original on 28 December 2020. Retrieved 26 September 2020.
Cole 1946, pp. 7–9. Cole, E. J. L. (1946). "The Castles of Maelienydd". The Radnorshire Society Transactions. 16: 3–19. Archived from the original on 28 December 2020. Retrieved 30 September 2020.
Browne & Pearson 2006, pp. 16–17. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 3. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 17. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 18. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, pp. 10, 16. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 1. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 4. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 5. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 6. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 7. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, pp. 3, 7. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, pp. 16–17. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Breeze 1999, pp. 173–174. Breeze, Andrew (1999). "Cefnllys and the Hereford Map". The Radnorshire Society Transactions. 69: 173–175. Archived from the original on 28 December 2020. Retrieved 26 September 2020.
Browne & Pearson 2006, p. 3. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 17. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 18. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, pp. 10, 16. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 1. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 4. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 5. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 6. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, p. 7. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Browne & Pearson 2006, pp. 3, 7. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle(PDF) (Report). Royal Commission on the Ancient and Historical Monuments of Wales. Archived(PDF) from the original on 28 December 2020. Retrieved 14 September 2020.
Cole 1946, pp. 7–9. Cole, E. J. L. (1946). "The Castles of Maelienydd". The Radnorshire Society Transactions. 16: 3–19. Archived from the original on 28 December 2020. Retrieved 30 September 2020.