Stephenson, David (January 2015). "Re-Thinking Thirteenth-Century Powys". Transactions of the Honourable Society of Cymmrodorion. Archived(PDF) from the original on 4 December 2023. Retrieved 4 December 2023.
McKenna, Catherine (2018). "Medieval Powys. Kingdom, principality and lordships, 1132-1293 by David Stephenson (review)". North American Journal of Celtic Studies. 2 (2): 186–188. doi:10.1353/cel.2018.a781219. S2CID231732252. Project MUSE781219.
McKenna, Catherine (2018). "Medieval Powys. Kingdom, principality and lordships, 1132-1293 by David Stephenson (review)". North American Journal of Celtic Studies. 2 (2): 186–188. doi:10.1353/cel.2018.a781219. S2CID231732252. Project MUSE781219.
Turner, Sharon (1803). A vindication of the genuineness of the ancient British poems of Aneurin, Taliesin, Llywarch Hen, and Merdhin, with specimens of the poems. E. Williams. JSTORcommunity.35016324. OCLC9860421233.[page needed]
McKenna, Catherine (2018). "Medieval Powys. Kingdom, principality and lordships, 1132-1293 by David Stephenson (review)". North American Journal of Celtic Studies. 2 (2): 186–188. doi:10.1353/cel.2018.a781219. S2CID231732252. Project MUSE781219.
Stephenson, David (January 2015). "Re-Thinking Thirteenth-Century Powys". Transactions of the Honourable Society of Cymmrodorion. Archived(PDF) from the original on 4 December 2023. Retrieved 4 December 2023.
Turner, Sharon (1803). A vindication of the genuineness of the ancient British poems of Aneurin, Taliesin, Llywarch Hen, and Merdhin, with specimens of the poems. E. Williams. JSTORcommunity.35016324. OCLC9860421233.[page needed]