Columbia subject headings:
Bulgaria--Foreign relations--Turkey.
Turkey--Foreign relations--Bulgaria.
Turks--Civil rights--Bulgaria.
Harvard subject headings:
Bulgaria--Foreign relations--Turkey.
Minorities--Bulgaria.
Turkey--Foreign relations--Bulgaria.
Turks--Bulgaria
Turks--Civil rights--Bulgaria.
Princeton subject headings:
Bulgaria--Foreign relations--Turkey.
Turkey--Foreign relations--Bulgaria.
Turks--Civil rights--Bulgaria.