Columbia subject headings:
Harvard subject headings:
Europe--Languages--Congresses.
Globalization--Europe--Congresses.
Multilingualism--Europe--Congresses.
Sociolinguistics--Europe--Congresses.
Princeton subject headings:
Europe--Languages--Law and legislation--Congresses.
Frisian language--Social aspects.
Globalization--Europe--Congresses.
Linguistic minorities--Europe--Congresses.
Multilingualism--Europe--Congresses.