Columbia subject headings:
Harvard subject headings:
European Union countries--Foreign relations--Great Britain.
European Union--Great Britain.
European Union--Membership.
Great Britain--Foreign relations--European Union countries.
Northern Ireland--Politics and government--21st century.
Referendum--Great Britain--History--21st century.
Princeton subject headings:
European Union--Great Britain.
European Union--Membership.
European Union--Northern Ireland.
Northern Ireland--Economic conditions--21st century.
Northern Ireland--Politics and government--1998-