Columbia subject headings:
Bŭlgarska komunisticheska partii︠a︡.
Rabotnicheski mladezhki sŭi︠u︡z (Bulgaria)
Harvard subject headings:
Bŭlgarska komunisticheska partii͡a.
Rabotnicheski mladezhki sŭi͡uz (Bulgaria)
Princeton subject headings: