Columbia subject headings:
Multilingualism--Switzerland--Graubünden.
Sociolinguistics--Switzerland--Graubünden.
Switzerland--Languages.
Harvard subject headings:
Graubünden (Switzerland)--Languages.
Multicultural education--Switzerland--Graubünden.
Multilingualism--Switzerland--Graubünden.
Princeton subject headings:
Multilingualism--Switzerland--Graubünden.
Sociolinguistics--Switzerland--Graubünden.
Switzerland--Languages.