Brittonic languages (English Wikipedia)

Koch, John (1981). "The Loss of Final Syllables and Loss of Declension in Brittonic". Proceedings of the Harvard Celtic Colloquium. 1: 22. ISSN 1545-0155. If there is any dateable phonological change which marks the end of British and the beginning of Welsh, Cornish and Breton, it is the loss of final syllables (with resulting break-up of the case system) which was completed about the middle of the sixth century.

kobv.de (Global: low place; English: low place)

opus.kobv.de

White, David L. (2010). "On the Areal Pattern of 'Brittonicity' in English and Its Implications" (PDF). In Tristram, Hildegard (ed.). The Celtic Englishes. Vol. IV: The Interface Between English and the Celtic Languages. University of Potsdam Press..

nih.gov (Global: 5^th place; English: 5^th place)

ncbi.nlm.nih.gov

Patterson, N.; Isakov, M.; Booth, T. (2021). "Large-scale migration into Britain during the Middle to Late Bronze Age". Nature. 601 (7894): 588–594. Bibcode:2022Natur.601..588P. doi:10.1038/s41586-021-04287-4. PMC 8889665. PMID 34937049. S2CID 245509501.

pubmed.ncbi.nlm.nih.gov

Patterson, N.; Isakov, M.; Booth, T. (2021). "Large-scale migration into Britain during the Middle to Late Bronze Age". Nature. 601 (7894): 588–594. Bibcode:2022Natur.601..588P. doi:10.1038/s41586-021-04287-4. PMC 8889665. PMID 34937049. S2CID 245509501.

oed.com (Global: 743^rd place; English: 419^th place)

"Brythonic, adj. and n.". Oxford English Dictionary. Oxford University Press. June 2013. Retrieved 17 July 2013.
"Brittonic, adj. and n.". OED Online. Oxford University Press. June 2013. Retrieved 17 July 2013.

semanticscholar.org (Global: 15^th place; English: 8^th place)

api.semanticscholar.org

Patterson, N.; Isakov, M.; Booth, T. (2021). "Large-scale migration into Britain during the Middle to Late Bronze Age". Nature. 601 (7894): 588–594. Bibcode:2022Natur.601..588P. doi:10.1038/s41586-021-04287-4. PMC 8889665. PMID 34937049. S2CID 245509501.

sussex.ac.uk (Global: 7,749^th place; English: 5,035^th place)

Coates, Richard (2007). "Invisible Britons: The view from linguistics". In Higham, Nick (ed.). Britons in Anglo-Saxon England. "Publications of the Manchester Centre for Anglo-Saxon Studies" series. Vol. 7. Woodbridge, Suffolk: Boydell & Brewer. pp. 172–191. Archived from the original on 14 March 2016 – via University of Sussex. URL is to a 2004 prepress version.

thefreelibrary.com (Global: 686^th place; English: 383^rd place)

Tristram, Hildegard (2004). "Diglossia in Anglo-Saxon England, or what was spoken Old English like?". Studia Anglica Posnaniensia. 40: 87–110.

tristram.de (Global: low place; English: low place)

hildegard.tristram.de

Tristram, H. (2007). "Why Don't the English Speak Welsh?". In Higham, Nick (ed.). Britons in Anglo-Saxon England (PDF). pp. 192–214. Archived from the original (PDF) on 19 July 2011.

web.archive.org (Global: 1^st place; English: 1^st place)

Tristram, H. (2007). "Why Don't the English Speak Welsh?". In Higham, Nick (ed.). Britons in Anglo-Saxon England (PDF). pp. 192–214. Archived from the original (PDF) on 19 July 2011.
Coates, Richard (2007). "Invisible Britons: The view from linguistics". In Higham, Nick (ed.). Britons in Anglo-Saxon England. "Publications of the Manchester Centre for Anglo-Saxon Studies" series. Vol. 7. Woodbridge, Suffolk: Boydell & Brewer. pp. 172–191. Archived from the original on 14 March 2016 – via University of Sussex. URL is to a 2004 prepress version.

worldcat.org (Global: 4^th place; English: 4^th place)

search.worldcat.org

Koch, John (1981). "The Loss of Final Syllables and Loss of Declension in Brittonic". Proceedings of the Harvard Celtic Colloquium. 1: 22. ISSN 1545-0155. If there is any dateable phonological change which marks the end of British and the beginning of Welsh, Cornish and Breton, it is the loss of final syllables (with resulting break-up of the case system) which was completed about the middle of the sixth century.

york.ac.uk (Global: 7,811^th place; English: 4,790^th place)

"Ancient DNA study reveals large scale migrations into Bronze Age Britain". University of York. 22 December 2021. Retrieved 21 January 2022.

Brittonic languages (English Wikipedia)

adsabs.harvard.edu (Global: 14th place; English: 9th place)

ui.adsabs.harvard.edu

archive.org (Global: 6th place; English: 6th place)

bbc.co.uk (Global: 11th place; English: 10th place)

books.google.com (Global: 3rd place; English: 3rd place)

doi.org (Global: 2nd place; English: 2nd place)

etymonline.com (Global: 669th place; English: 670th place)

ghostarchive.org (Global: 64th place; English: 28th place)

gla.ac.uk (Global: 2,504th place; English: 1,408th place)

theses.gla.ac.uk

jstor.org (Global: 23rd place; English: 15th place)

kobv.de (Global: low place; English: low place)

opus.kobv.de

nih.gov (Global: 5th place; English: 5th place)

ncbi.nlm.nih.gov

pubmed.ncbi.nlm.nih.gov

oed.com (Global: 743rd place; English: 419th place)

semanticscholar.org (Global: 15th place; English: 8th place)

api.semanticscholar.org

sussex.ac.uk (Global: 7,749th place; English: 5,035th place)

thefreelibrary.com (Global: 686th place; English: 383rd place)

tristram.de (Global: low place; English: low place)

hildegard.tristram.de

web.archive.org (Global: 1st place; English: 1st place)

worldcat.org (Global: 4th place; English: 4th place)

search.worldcat.org

york.ac.uk (Global: 7,811th place; English: 4,790th place)

adsabs.harvard.edu (Global: 14^th place; English: 9^th place)

archive.org (Global: 6^th place; English: 6^th place)

bbc.co.uk (Global: 11^th place; English: 10^th place)

books.google.com (Global: 3^rd place; English: 3^rd place)

doi.org (Global: 2^nd place; English: 2^nd place)

etymonline.com (Global: 669^th place; English: 670^th place)

ghostarchive.org (Global: 64^th place; English: 28^th place)

gla.ac.uk (Global: 2,504^th place; English: 1,408^th place)

jstor.org (Global: 23^rd place; English: 15^th place)

nih.gov (Global: 5^th place; English: 5^th place)

oed.com (Global: 743^rd place; English: 419^th place)

semanticscholar.org (Global: 15^th place; English: 8^th place)

sussex.ac.uk (Global: 7,749^th place; English: 5,035^th place)

thefreelibrary.com (Global: 686^th place; English: 383^rd place)

web.archive.org (Global: 1^st place; English: 1^st place)

worldcat.org (Global: 4^th place; English: 4^th place)

york.ac.uk (Global: 7,811^th place; English: 4,790^th place)