J. Waddell 1991 The Celticization of the West: an Irish perspective, in C. Chevillot and A. Coffyn (eds), L'Age du Bronze Atlantique. Actes du 1er Colloque de Beynac, 349-66. Beynac.
Newman,C.(2009) The Sword in the Stone: previously unrecognised archaeological evidence of ceremonies of the later Iron Age and early medieval period, in G. Cooney et al (eds), Relics of old decency: archaeological studies in later prehistory. Festschrift for Barry Raftery, 425-36. Wordwell, Dublin.