Columbia subject headings:
Monasticism and religious orders--Rules--History.
Harvard subject headings:
Monastic and religious life--History--Middle Ages, 600-1500.
Monasticism and religious orders--Rules--History.
Princeton subject headings:
Monasticism and religious orders--History--Early church, ca. 30-600--Sources.
Monasticism and religious orders--History--Middle Ages, 600-1500--Sources.
Monasticism and religious orders--Rules--History--Sources.