Ceretic di Alt Clut: differenze tra le versioni

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* Alfred Smyth, ''Warlords and Holy Men'', Edimburgo 1984;

* Anne Williams, Alfred P. Smyth e D.B. Kirby (eds.), ''A Biographical Dictionary of Dark Age Britain'', Londra 1991, s.v. ''Ceretic'', pp. 78-8;