Template:R:Celticity

Koch, John T.; Mallory, James P.; aan de Wiel, Caroline; Busse, Peter; Löffler, Marion; Karl, Raimund; Minard, Antone; Ó Faoláin, Simon; Schultze-Thulin, Britta; Roberts, Esther (12 June 2002). Hughes, Marian B. (ed.). "English–Proto-Celtic Wordlist" (PDF). Celticity. Centre for Advanced Welsh & Celtic Studies, University of Wales.