Columbia subject headings:
Painting, Gothic--Italy--Siena.
Painting, Italian--Italy--Siena.
Painting, Renaissance--Italy--Siena.
Harvard subject headings:
Painting, Gothic--Italy--Siena.
Painting, Italian--Italy--Siena
Painting, Renaissance--Italy--Siena.
Princeton subject headings:
Painting, Gothic--Italy--Siena.
Painting, Italian--Italy--Siena.
Painting, Renaissance--Italy--Siena.