Columbia subject headings:
Cistercians--Europe--History.
Monasticism and religious orders--History--Middle Ages, 600-1500.
Harvard subject headings:
Cistercians--Europe--History.
Monasticism and religious orders--History--Early church, ca. 30-600.
Princeton subject headings:
Cistercians--Europe--History.
Monasticism and religious orders--History--Early church, ca. 30-600.