Columbia subject headings:
Christian sociology--History--Middle Ages, 600-1500.
Church history--Middle Ages, 600-1500.
Medieval Christianity.
Weber, Max, 1864-1920.
Harvard subject headings:
Christian sociology--Middle Ages, 600-1500.
Church history--Middle Ages, 600-1500
Weber, Max, 1864-1920--Views on medieval Christianity.
Princeton subject headings:
Religion and sociology.
Weber, Max, 1864-1920--Views on Christianity.