Columbia subject headings:
Harvard subject headings:
Austria--History--20th century.
Austria--History--21st century.
Nationalism--Austria--History.
Nationalism--Serbia--History.
Serbia--History--20th century.
Serbia--History--21st century.
Princeton subject headings:
Austria--Foreign relations--20th century.
Austria--Foreign relations--Serbia.
Serbia--Foreign relations--20th century.
Serbia--Foreign relations--Austria.