Celtic Culture : A Historical Encyclopedia, Santa Barbara: ABC-CLIO http://www.encyclopedia.com/doc/1O29-CUMBRIC.html https://web.archive.org/web/20160403155123/http://www.cumbraek.co.uk/ http://www.languagesgulper.com/eng/Cumbric.html https://web.archive.org/web/20150322185616/http://www.spns.org.uk/oldnotes3.html
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