Columbia subject headings:
Christian sociology--Europe--History--Congresses.
Church history--Middle Ages, 600-1500--Congresses.
Europe--Church history--Congresses.
Harvard subject headings:
Christian sociology--Europe--History--Congresses.
Church history--Middle Ages, 600-1500--Congresses.
Europe--Church history--Congresses.
Princeton subject headings:
Christian sociology--Europe--History--Congresses.
Church history--Middle Ages, 600-1500--Congresses.
Europe--Church history--Congresses.