Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Economic integration.
Balkan Peninsula--Politics and government.
Balkan Peninsula--Relations--European Union countries.
European Union countries--Politics and government.
European Union countries--Relations--Balkan Peninsula.
European Union--Balkan Peninsula.
Peace-building--Balkan Peninsula.
Security, International--Balkan Peninsula.
Princeton subject headings:
Balkan Peninsula--Relations--European Union countries.
European Union countries--Relations--Balkan Peninsula.