Columbia subject headings:
Harvard subject headings:
Francis, of Assisi, Saint, 1182-1226
Franciscans--Rules--Early works to 1800.
Monasticism and religious orders--Rules--Early works to 1800.
Regula Ordinis Franciscani Saecularis.
Princeton subject headings:
Franciscans--History--16th century.
Franciscans--Rules--History and criticism.