Columbia subject headings:
Business enterprises--South Africa--Directories.
Corporations--South Africa--Directories.
Information technology--South Africa--Directories.
Harvard subject headings:
Computer industry--South Africa.
Computer software industry--South Africa.
Corporations--South Africa--Directories.
Information technology--South Africa.
Telecommunication equipment industry--South Africa.
Telecommunication--South Africa.
Princeton subject headings:
Information technology--South Africa.
Telecommunication--South Africa.