Columbia subject headings:
Africa--Languages--Social aspects--Congresses.
Language and education--Africa--Congresses.
Language policy--Africa--Congresses.
Multilingualism--Africa--Congresses.
Harvard subject headings:
Africa--Languages--Social aspects--Congresses.
Language and education--Africa--Congresses.
Language policy--Africa--Congresses.
Multilingualism--Africa--Congresses.
Princeton subject headings: