Columbia subject headings:
Electronic commerce--Taxation--Law and legislation--United States.
Electronic commerce--Taxation.
Internet industry--Taxation.
Internet service providers--Taxation.
Internet--Taxation.
Harvard subject headings:
Electronic commerce--Taxation
Electronic commerce--Taxation--Law and legislation
Electronic commerce--Taxation--Law and legislation--United States.
Electronic commerce--Taxation--United States.
Internet industry--Taxation--Law and legislation--United States.
Internet industry--Taxation--Law and legislation.
Internet industry--Taxation--United States.
Internet industry--Taxation.
Princeton subject headings: