Columbia subject headings:
Harvard subject headings:
Bilingualism--Congresses
Communicative competence--Congresses.
Language and culture--Congresses.
Language and languages--Ability testing--Congresses
Princeton subject headings:
Bilingualism--Congresses.
Communicative competence--Congresses.
Language and culture--Congresses.
Language and languages--Ability testing--Congresses.