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Jackson, Kenneth. Studies in the Early British Church : The Sources for the Life of St Kentigern. edited by Chadwick, Nora K., 273-357. Cambridge: Cambridge University Press, 1958.
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Gwaith Llywelyn Brydydd Hoddnant, Dafydd ap Gwilym, Hillyn ac Eraill edited by Parry Owen, Ann gyda Foster Evans, Dylan. Aberystwyth: Canolfan Uwchefrydiau Cymreig a Cheltaidd, 1996. \| Coleg Cymraeg Cenedlaethol https://adnoddau.s3.eu-west-2.amazonaws.com/Beirdd/05+Gwaith+Llywelyn+Brydydd+Hoddnant.pdf [Agored/Open]
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Gwaith Llywelyn Goch ap Meurig Hen edited by Johnston, Dafydd. Aberystwyth: Canolfan Uwchefrydiau Cymreig a Cheltaidd Prifysgol Cymru, 1998. \| Coleg Cymraeg Cenedlaethol https://adnoddau.s3.eu-west-2.amazonaws.com/Beirdd/10+Gwaith+Llywelyn+Goch+ap+Meurig+Hen.pdf [Agored/Open]
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Owen, O. Eilian. "Rac deuur ineutur ytirran." Zeitschrift für celtische Philologie 5, (1905): 572-4. \| De Gruyter https://www.degruyter.com/document/doi/10.1515/zcph.1905.5.1.572/html [Tanysgrifiad/Subscription]
Richards, Melville. Welsh administrative and territorial units Cardiff: University of Wales Press, 1969.
Sims-Williams, Patrick. "‘Dark’ and ‘Clear’ Y in Medieval Welsh Orthography: Caligula versus Teilo." Transactions of the Philological Society 119, no. 1, (2021): 1-39. \| Aberystwyth Research Portal https://research.aber.ac.uk/en/publications/dark-and-clear-y-in-medieval-welsh-orthography-caligula-versus-te [Agored/Open]
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