Columbia subject headings:
Africa, Southern--Languages--Congresses.
Khoisan languages--Congresses.
Linguistics--Africa, Southern--Congresses.
Harvard subject headings:
Khoisan languages--Congresses.
Linguistics--Africa, Southern--Congresses.
Princeton subject headings:
Africa, Southern--Languages--Congresses.
Khoisan languages--Congresses.
Linguistics--Africa, Southern--Congresses.