Columbia subject headings:
Harvard subject headings:
Carthusian architecture--Italy--Siena (Province)
Carthusians--Italy--Siena (Province)
Christian art and symbolism--Italy--Siena (Province)
Siena (Italy : Province)--Church history.
Princeton subject headings:
Certosa di Pontignano (Pontignano, Italy)
Cistercian architecture--Italy--Siena (Province).
Cistercian art--Italy--Siena (Province).
Cistercians--Italy--Siena (Italy : Province).