Columbia subject headings:
Bulgaria--Politics and government--1944-1990.
Bŭlgarska komunisticheska partii︠a︡.
Harvard subject headings:
Bulgaria--Politics and government.
Bŭlgarska komunisticheska partii︠a︡--Party work.
Princeton subject headings:
Bulgaria--Politics and government--1944-1990.
Bulgaska komunisticheska partiia.