Columbia subject headings:
Balkan Peninsula--History--Bibliography--Catalogs.
Gosudarstvennai͡a publichnai͡a biblioteka imeni M.E. Saltykova-Shchedrina. Otdel rukopiseĭ i redkikh knig--Catalogs.
Slavs, Southern--Bibliography--Catalogs.
Harvard subject headings:
Balkan Peninsula--History--Bibliography--Catalogs.
Gosudarstvennai︠a︡ publichnai︠a︡ biblioteka imeni M.E. Saltykova-Shchedrina. Otdel rukopiseĭ i redkikh knig--Catalogs.
Slavs, Southern--Bibliography--Catalogs.
Princeton subject headings: