Columbia subject headings:
Balkan Peninsula--Bibliography.
Balkan Peninsula--Study and teaching--History.
Institut za balkanistika (Bŭlgarska akademii︠a︡ na naukite)--History.
Harvard subject headings:
Balkan Peninsula--Bibliography.
Balkan Peninsula--Study and teaching--History.
Institut za balkanistika (Bŭlgarska akademii︠a︡ na naukite)--History.
Princeton subject headings: