Columbia subject headings:
Computer industry--Directories.
Computers--Periodicals.
Electronic data processing--Directories.
Electronic data processing--Periodicals.
Harvard subject headings:
Computer industry--Directories
Computers,--Periodicals.
Electronic data processing--Directories.
Electronic data processing--Periodicals
Princeton subject headings:
Computer industry--Directories.
Computers--Yearbooks.
Directories.
Electronic data processing--Directories.
Electronic data processing--Yearbooks.