Columbia subject headings:
Francis, of Assisi, Saint, 1182-1226--Drama.
Operas--Librettos.
Harvard subject headings:
Francis, of Assisi, Saint, 1182-1226--Drama.
Operas--Librettos
Princeton subject headings:
Francis, of Assisi, Saint, 1182-1226--Drama.
Librettos.
Operas--Librettos.