Columbia subject headings:
Bulgaria--Foreign relations--Yugoslavia.
Macedonia--Historiography.
Macedonian question.
Yugoslavia--Foreign relations--Bulgaria.
Harvard subject headings:
Bulgaria--Foreign relations--Yugoslavia.
Macedonia--Historiography.
Macedonian question.
Yugoslavia--Foreign relations--Bulgaria.
Princeton subject headings:
Bulgaria--Foreign relations--Yugoslavia.
Macedonian question.
Macedonians--Bulgaria.
Yugoslavia--Foreign relations--Bulgaria.