Columbia subject headings:
Benedict, Saint, Abbot of Monte Cassino. Regula.
Benedictines--Rules.
Monasticism and religious orders--Rules.
Harvard subject headings:
Benedict, Saint, Abbot of Monte Cassino. Regula.
Monasticism and religious orders (Canon law)--History--Sources.
Princeton subject headings:
Benedict, Saint, Abbot of Monte Cassino. Regula.
Christianity and law--History.
Ecclesiastical law--History.