Columbia subject headings:
Harvard subject headings:
Pisa (Italy)--Foreign relations--Italy--Sardinia.
Sardinia (Italy)--Foreign relations--Italy--Pisa.
Sardinia (Italy)--History.
Princeton subject headings:
Pisa (Italy)--Foreign relations--Italy--Sardinia.
Sardinia (Italy)--Foreign relations--Italy--Pisa.
Sardinia (Italy)--History.