Blažek, Václav (2009). ”On the position of Gaulish within Celtic from the point of view of glottochronology”, Indogermanische Forschungen. 114. Berlin: de Gruyter
Falileyev, Alexander (2000). Etymological Glossary of Old Welsh. Tübingen: Max Niemeyer Verlag; FALILEYEV, Alexandre I. (2008). Le Vieux-Gallois. Potsdam: Universitätsverlag Potsdam
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This map shows the etymological links in a geographic context.