1804 yng Nghymru: Gwahaniaeth rhwng fersiynau

* [[Edward Davies (hynafiaethydd)|Edward Davies]] - ''Celtic Researches on the Origin, Traditions and Languages of the Ancient Britons'' ([https://archive.org/details/celticresearches00daviuoft/page/n6 copi ar lein gan Internet archive]) <ref>{{Cite book|title=Celtic researches on the origin, traditions & language of the Ancient Britons : with some introductory sketches, on primitive society|url=http://archive.org/details/celticresearches00daviuoft|publisher=London : Davies|date=|others=|first=Edward|last=Davies|year=|isbn=|location=|pages=}}</ref>