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== Литература ==
* Bromwich, Rachel, ''Trioedd Ynys Prydein: The Triads of the Island of Britain''. Cardiff: University of Wales Press, 1978; revised ed. 1991
* Clarkson, Tim. [httphttps://www.mun.ca/mst/heroicage/issues/2/ha2rh.htm «Rhydderch Hael.» ''The Heroic Age'', Autumn/Winter 1999]
* MacQuarrie, Alan, «The Kings of Strathclyde», in A. Grant & K.Stringer (eds.) ''Medieval Scotland: Crown, Lordship and Community, Essays Presented to G. W. S. Barrow'', (Edinburgh, 1993), pp. 1-19.
* Bernhard Maier. [httphttps://books.google.at/books?id=9Yu24J98LkoC&pg=PA182&dq=Rhydderch+Hael&hl=de&ei=XbAITpPEGoTCtAbBw6miDA&sa=X&oi=book_result&ct=result&resnum=2&ved=0CC4Q6AEwATgK#v=onepage&q=Rhydderch%20Hael&f=false ''Die Kelten: ihre Geschichte von den Anfängen bis zur Gegenwart.''] C.H.Beck, 2000, ISBN 9783406460944, S. 182.
* John T. Koch. [httphttps://books.google.at/books?id=f899xH_quaMC&pg=PA1323&dq=Rhydderch+Hael&hl=de&ei=ma0ITvKeLIvJsgbqpYWUDA&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC0Q6AEwAA#v=onepage&q=Rhydderch%20Hael&f=false ''Celtic culture: a historical encyclopedia, Bände 1-5.''] ABC-CLIO, 2006, ISBN 9781851094400, S. 1323.
* Robert Williams. [httphttps://books.google.at/books?id=_wMGAAAAQAAJ&pg=PA442&dq=Rhydderch+Hael&hl=de&ei=ma0ITvKeLIvJsgbqpYWUDA&sa=X&oi=book_result&ct=result&resnum=3&ved=0CDYQ6AEwAg#v=onepage&q=Rhydderch%20Hael&f=false ''Enwogion Cymru: A biographical dictionary of eminent Welshmen, from the earliest times to the present, and including every name connected with the ancient history of Wales.''] W. Rees, 1852, S. 442.
* Bernhard Maier: ''Lexikon der keltischen Religion und Kultur''. Kröner, Stuttgart 1994, ISBN 3-520-46601-5.
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