Columbia subject headings:
Constitutional law--European Union countries--Congresses.
European federation--Congresses.
Treaty on European Union--Congresses.
Harvard subject headings:
Constitutional law--European Union countries--Congresses
European federation--Congresses
Treaty on European Union--Congresses.
Princeton subject headings:
Constitutional law--European Union countries--Congresses.
European federation--Congresses.
Treaty on European Union--Congresses.