Columbia subject headings:
Terrorism--Government policy--European Union countries.
Terrorism--Government policy--United States.
Terrorism--Prevention--International cooperation.
Harvard subject headings:
Terrorism--Government policy--European Union countries.
Terrorism--Government policy--United States
Terrorism--Prevention--International cooperation
Princeton subject headings:
Terrorism--Government policy--European Union countries.
Terrorism--Government policy--United States.
Terrorism--Prevention--International cooperation.