Columbia subject headings:
Electronic information resource searching--Periodicals.
Electronic information resources--Periodicals.
Information storage and retrieval systems--Periodicals.
Harvard subject headings:
Electronic information resource searching--Periodicals.
Electronic information resources--Periodicals.
Information storage and retrieval systems--Periodicals
Princeton subject headings:
Electronic information resource searching--Periodicals.
Electronic information resources--Periodicals.
Information storage and retrieval systems--Periodicals.
Periodicals.