Griffiths, R. A. (1962). Royal government in the southern counties of the Principality of Wales, 1422-145. University of Bristol.
Lua i Stíl Chicago (17ú heag.)Griffiths, Ralph Alan. Royal Government in the Southern Counties of the Principality of Wales, 1422-145. England: University of Bristol, 1962.
Lua MLA (8ú heag.)Griffiths, Ralph Alan. Royal Government in the Southern Counties of the Principality of Wales, 1422-145. University of Bristol, 1962.
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