Columbia subject headings:
Harvard subject headings:
Catholic Church--Foreign relations--Italy--Sources.
Catholic Church--Italy--History--Sources.
Church and state--Italy--History--Sources.
Italy--Church history--Sources.
Italy--Foreign relations--Catholic Church--Sources.
Princeton subject headings:
Catholic Church--Foreign relations--Italy--Sources.
Catholic Church--Italy--History--Sources.
Church and state--Italy--History--Sources.
Italy--Church history--Sources.
Italy--Foreign relations--Catholic Church--Sources.