Coba jelasin Catatan dari Bahasa Britonik Umum dong

Filppula, M.; Klemola, J.; Pitkänen, H. (2001); The Celtic Roots of English, (Studies in Languages, No. 37); University of Joensuu, Faculty of Humanities; .

Forsyth, K. (1997), Language in Pictland.

Jackson, Kenneth H. (1953), Language and History in Early Britain.

Jackson, Kenneth H. (1955), "The Pictish Language"; in F. T. Wainwright, The Problem of the Picts; London: Nelson.

Koch, John T. (1986), "New Thought on Albion, Ieni and the 'Pretanic Isles'", Proceedings of the Harvard Celtic Colloquium, 6: pp. 1–28.

Lambert, Pierre-Yves [ed.] (2002), Recueil des inscriptions gauloises II.2. Textes gallo-latins sur instrumentum; Paris: CNRS Editions; pp. 304–306.

Lambert, Pierre-Yves (2003), La langue gauloise; 2nd ed.; Paris: Editions Errance; p. 176.

Lockwood, W. B. (1975), Languages of the British Isles Past and Present; London: Deutsch; .

Ostler, Nicholas (2005), Empires of the Word; London: HarperCollins; .

Price, Glanville. (2000), Languages of Britain and Ireland; Blackwell; .

Rivet, A. and Smith, C. (1979), The Place-names of Roman Britain

Sims-Williams, Patrick (2003), The Celtic Inscriptions of Britain: Phonology and Chronology, c. 400–1200; Oxford, Blackwell; .

Ternes, Elmar [ed.] (2011), Brythonic Celtic – Britannisches Keltisch: From Medieval British to Modern Breton; Bremen: Hempen Verlag.

Trudgill, P. [ed.] (1984), Language in the British Isles; Cambridge University Press.

Willis, David (2009), "Old and Middle Welsh"; in The Celtic Languages, 2nd ed.; eds. Martin J. Ball & Nichole Müller; New York: Routledge; ; pp. 117–160.