Columbia subject headings:
Harvard subject headings:
Africa--Languages.
African languages--Social aspects--Congresses.
African languages--Social aspects.
African languages.
Language policy--Africa--Congresses.
Language policy--Africa.
Multilingual education--Africa--Congresses.
Multilingualism--Africa--Congresses.
Multilingualism--Africa.
Sociolinguistics--Africa--Congresses.
Sociolinguistics--Africa.
Princeton subject headings:
African languages--Social aspects.
African languages.
Language policy--Africa.
Multilingualism--Africa.
Sociolinguistics--Africa.