Columbia subject headings:
Councils and synods--Germany--History--Sources.
Councils and synods--Italy--History--Sources.
Germany--Church history--Sources.
Italy--Church history--Sources.
Harvard subject headings:
Church history--Middle Ages, 600-1500--Sources.
Councils and synods--Germany--History--Sources.
Councils and synods--Italy--History--Sources.
Germany--Church history--843-1517--Sources.
Italy--Church history--476-1400--Sources.
Princeton subject headings:
Councils and synods--Germany--History--Sources.
Councils and synods--Italy--History--Sources.
Germany--Church history--Sources.
Italy--Church history--Sources.