Columbia subject headings:
Harvard subject headings:
European Union countries--Languages--Variation--Congresses.
Language policy--European Union countries--Congresses.
Multilingualism--European Union countries--Congresses.
Princeton subject headings:
European Union countries--Languages--Congresses.
Language and languages--Study and teaching--East Asia--Congresses.
Language policy--European Union countries--Congresses.
Lingua francas--European Union countries--Congresses.
Multilingualism--European Union countries--Congresses.