Columbia subject headings:
Computer programs--Directories.
Libraries--Automation.
Library science--Computer programs--Directories.
Microcomputers.
Harvard subject headings:
Computer software--Directories.
Libraries--Automation
Library science--Computer programs--Directories.
Microcomputers.
Princeton subject headings:
Computer software--Directories.
Libraries--Automation.
Library science--Computer programs--Directories.
Microcomputers.