Columbia subject headings:
Bologna (Italy)--Church history.
Christian heresies--Italy--Bologna.
Harvard subject headings:
Bologna (Italy)--Church history.
Christian heresies--Italy--Bologna--History--Middle Ages, 600-1500.
Christian heresies--Italy--Bologna.
Princeton subject headings:
Bologna (Italy)--Church history.
Christian heresies--Italy--Bologna--History--Middle Ages, 600-1500.