Columbia subject headings:
African languages--Grammar--Congresses.
African languages--Syntax--Congresses.
African languages--Verb--Congresses.
Harvard subject headings:
African languages--Grammar--Congresses.
African languages--Syntax--Congresses.
African languages--Verb--Congresses.
Princeton subject headings:
African languages--Grammar.
African languages--Syntax.
African languages--Verb.