Columbia subject headings:
Harvard subject headings:
Bilingualism--France--Brittany.
Breton language.
French language--France--Brittany.
Princeton subject headings:
Breton language--Psychological aspects.
Breton language--Social aspects.
Brittany (France)--Languages.
French language--France--Brittany--Psychological aspects.
French language--France--Brittany--Social aspects.
Languages in contact--France--Brittany.
Sociolinguistics.