Columbia subject headings:
Harvard subject headings:
City-states--Italy--History--To 1500.
Italy--Politics and government.
Law--Italy--Bologna--History--To 1500.
Law--Italy--Perugia--History--To 1500.
Law--Italy--Siena--History--To 1500.
Princeton subject headings:
City-states--Italy--History--To 1500.
Italy--Politics and government.
Law--Italy--History--To 1500.