Columbia subject headings:
Cologne (Germany)--Church history--Sources.
Confraternities--Germany--Cologne--History--Sources.
Harvard subject headings:
Cologne (Germany)--Church history--Sources.
Confraternities--Germany--Cologne--History--Sources.
Princeton subject headings:
Brotherhoods--Germany--Cologne--History--Sources.
Church history--Middle Ages, 600-1500--Sources.
Cologne (Germany)--Church history.
Laity--Catholic Church--History--Sources.
Laity--Germany--Cologne--History--Sources.