Columbia subject headings:
Francis, of Assisi, Saint, 1182-1226.
Giotto, 1266?-1337.
Sassetta, approximately 1400-1450.
Harvard subject headings:
Francis, of Assisi, Saint, 1182-1226
Giotto, 1266?-1337.
Sassetta, 1392-1450 or 1451.
Princeton subject headings:
Francis, of Assisi, Saint, 1182-1226.
Giotto, 1266?-1337.
Sassetta, approximately 1400-1450.