Columbia subject headings:
National security--Law and legislation--Europe.
Terrorism--Europe--Prevention--International cooperation.
Terrorism--Prevention--Law and legislation--Europe.
Harvard subject headings:
National security--Law and legislation--Europe.
Terrorism--Europe--Prevention--International cooperation.
Terrorism--Government policy--European Union countries.
Terrorism--Prevention--Law and legislation
Terrorism--Prevention--Law and legislation--Europe.
Princeton subject headings:
National security--Law and legislation--Europe.
Terrorism--Europe--Prevention--International cooperation.
War on Terrorism, 2001-2009--Law and legislation--Europe.