Columbia subject headings:
Harvard subject headings:
Language and languages--Research--Congresses.
Language and languages--Study and teaching--Congresses
Multilingualism--Congresses.
Second language acquisition--Congresses.
Princeton subject headings:
Language and languages--Research--Congresses.
Language and languages--Study and teaching--Congresses.
Multilingualism--Congresses.
Second language acquisition--Congresses.