Columbia subject headings:
Constitutional law--Congresses.
Constitutions--Congresses.
European federation--Congresses.
Federal government--Congresses.
Harvard subject headings:
Constitutional law--Congresses
Constitutional law--European Union countries--Congresses
Constitutions--Congresses.
European federation--Congresses
Federal government--Congresses
Federal government--European Union countries--Congresses.
Princeton subject headings: