Columbia subject headings:
Europe--Economic integration.
Europe--Politics and government--1989-
European Union.
Non-governmental organizations--Europe.
Harvard subject headings:
Europe--Politics and government--21st century.
European Union
European Union countries--Foreign relations--21st century.
Political realism.
Princeton subject headings:
Europe--Politics and government--21st century.
European Union countries--Foreign relations--21st century.
European Union.
Political realism.