Columbia subject headings:
Bŭlgarska komunisticheska partii︠a︡.
Bŭlgarski zemedelski naroden sŭi︠u︡z.
Harvard subject headings:
Bŭlgarska komunisticheska partii︠a︡.
Bŭlgarski zemedelski naroden sŭi︠u︡z.
Princeton subject headings: