Columbia subject headings:
Income tax--United States.
Inheritance and transfer tax--United States.
Value-added tax--Europe.
Value-added tax--United States.
Harvard subject headings:
Income tax--United States.
Inheritance and transfer tax--United States.
Value-added tax--Europe.
Value-added tax--United States.
Princeton subject headings:
Income tax--United States.
Inheritance and transfer tax--United States.
Value-added tax--Europe.
Value-added tax--United States.