Columbia subject headings:
Electronic commerce--United States.
Electronic government information--United States.
Government purchasing--United States--Data processing.
Internet marketing--United States.
Harvard subject headings:
Electronic commerce--United States
Electronic government information--United States.
Government purchasing--United States--Data processing.
Internet marketing--United States
Princeton subject headings:
Electronic commerce--United States.
Electronic government information--United States.
Government purchasing--United States--Data processing.
Internet marketing--United States.