Columbia subject headings:
Political participation--Europe.
Political psychology.
Referendum--Europe.
Harvard subject headings:
Administrative procedure--Europe--Citizen participation--Congresses.
Petition, Right of--Europe--Congresses.
Political participation--Europe--Congresses.
Referendum--Europe--Congresses.
Princeton subject headings:
Administrative procedure--Europe--Citizen participation--Congresses.
Petition, Right of--Europe--Congresses.
Political participation--Europe--Congresses.
Referendum--Europe--Congresses.