↑ Julius Caesar, "Commentarii de Bello Gallico" s:Commentaries on the Gallic War/Book 1: "All Gaul is divided into three parts, one of which the Belgae live, another in which the Aquitani live, and the third are those who in their own tongue are called Celts ("Celtae"), in our language Gauls ("Galli").
↑ (Lhuyd, p. 290) Lhuyd, E. "Archaeologia Britannica; An account of the languages, histories, and customs of the original inhabitants of Great Britain." (reprint ed.) Irish University Press, 1971. ISBN 0-7165-0031-0
↑ Neilson, William A. (ed.) (1957). Webster's New International Dictionary of the English Language, second edition. G & C Merriam Co. pp. p.2903.CS1 maint: Extra text: authors list (link) CS1 maint: Extra text (link)
↑ 2001 p 95. La lengua de los Celtas y otros pueblos indoeuropeos de la península ibérica. In Almagro-Gorbea, M., Mariné, M. and Álvarez-Sanchís, J.R. (eds) Celtas y Vettones, pp. 115-121. Ávila: Diputación Provincial de Ávila.
