Columbia subject headings:
Bii͡a Cherkva (Bulgaria)--Biography.
Bii͡a Cherkva (Bulgaria)--History.
Vankov, Ilii͡a--Diaries.
Harvard subject headings:
Bii︠a︡ Cherkva (Bulgaria)--Biography.
Bii︠a︡ Cherkva (Bulgaria)--History.
Bi︠a︡la Cherkva (Bulgaria)--Biography--Sources.
Bi︠a︡la Cherkva (Bulgaria)--History--Sources.
Vankov, Ilii͡a--Diaries.
Princeton subject headings:
Bii︠a︡ Cherkva (Bulgaria)--Biography.
Bii︠a︡ Cherkva (Bulgaria)--History.
Vankov, Ilii︠a︡--Diaries.