Columbia subject headings:
Balkan Peninsula--Economic integration.
Balkan Peninsula--Foreign relations.
European cooperation.
Regionalism--Balkan Peninsula.
Harvard subject headings:
Balkan Peninsula--Economic integration.
Balkan Peninsula--Foreign relations.
European cooperation.
Regionalism--Balkan Peninsula.
Princeton subject headings:
Balkan Peninsula--Economic integration.
Balkan Peninsula--Foreign relations.
European cooperation.
Regionalism--Balkan Peninsula.