Columbia subject headings:
Fortification--Italy--San Costanzo.
Martini, Francesco di Giorgio, 1439-1502.
Harvard subject headings:
Castles--Italy
Fortification--Italy
Martini, Francesco di Giorgio, 1439-1502
Military architecture--Italy.
San Costanzo (Castle : Italy)
Princeton subject headings:
Fortification--Italy--San Costanzo.
Martini, Francesco di Giorgio, 1439-1502.