The following works have been used in producing this site.
General
- Jackson, K. (1953) Language and History in Early Britain, Edinburgh University Press
- Koch, JT.(ed.) (2006) Celtic Culture: a historical encyclopedia, ABC-CLIO Ltd.
- Matasović, R. (2009) Etymological Dictionary of Proto-Celtic, Koninklijke Brill NV, Leiden
- Price, G. (ed.) (2000) Languages in Britain and Ireland, Blackwell, Oxford
- Schrijver, P. (1995) Studies in British Celtic Historical Phonology, Rodopi, Amsterdam
Place Names
- Ekwall, E. (1960) The Concise Oxford Dictionary of English Place-Names, 4th edition, OUP
- Lee, J. (1998) The Place Names of Cumbria, Cumbria Heritage Services, Carlisle
- Mills, AD. (1991) A Dictionary of British Place-Names, OUP
- Nicolaisen, WHF. (1976) Scottish Place-Names, BT Batsford Ltd, London
- Watson, W.J. (1926) The Celtic Place-Names of Scotland, Birlinn, Edinburgh
- Weatherhill, C. (2009) A Concise Dictionary of Cornish Place-Names, Evertype, Co. Mhaigh Eo.
History
- Phythian-Adams, C. (1996) Land of the Cumbrians, Scolar Press, Aldershot
- Rollason, D. (2003) Northumbria 500-1100: Creation and destruction of a kingdom, CUP
Other Languages
- Bock, A. et al (2012) Gerlyver an FSS, Maga, Truro
- Fargher, DC. (1979) Fargher’s English-Manx Dictionary, Shearwater Press, IOM
- Goodwin, E. (1997) First Lessons in Manx, revised edition, Yn Cheshaght Ghailckagh, IOM
- Henry, V. (1900) Lexique Étymologique du Breton Moderne, Rennes
- Hemon, R. & Everson, M. (trans.) (2007) Breton Grammar, 2nd edition, Evertype, Co. Mhaigh Eo
- McLeod WT. (ed.) (1957) Collins Gem Latin Dictionary, William Collins Sons & Co. Ltd
- Mac Mathúna, S. & Ó Corráin, A. (eds.) (1995) Collins Gem Irish Dictionary, HarperCollins Publishers
- Meurig Evans, H. & Thomas, WO. (eds.) (1953) Y Geiriadur Newydd, Christopher Davies, Swansea
- Mitchell, B. & Robinson, FC. (1986) A Guide to Old English, 4th edition, Basil Blackwell Ltd, Oxford
- Morris Jones, J. (1913) A Welsh Grammar Historical and Comparative, Clarendon, Oxford
- Williams, SJ. (1980) A Welsh Grammar, University of Wales Press
- An Stòr-dàta Briathrachais Gàidhlig at http://www2.smo.uhi.ac.uk/gaidhlig/faclair/sbg/, accessed 2011-2014
- Electronic Dictionary of the Irish Language at http://edil.qub.ac.uk, accessed 2013-14