Columbia subject headings:
Language and languages--Political aspects--Congresses.
Language policy--Congresses.
Language policy.
Linguistic minorities--Civil rights--Congresses.
Sociolinguistics.
Harvard subject headings:
Language and languages--Political aspects--Congresses
Language policy--Congresses.
Linguistic minorities--Civil rights--Congresses.
Princeton subject headings:
Language policy.
Sociolinguistics.