Columbia subject headings:
Balkan Peninsula--History.
Harvard subject headings:
Balkan Peninsula--History, Military.
Balkan Peninsula--History.
Christianity and other religions--Balkan Peninsula--Islam.
Islam--Balkan Peninsula--Relations--Christianity.
Princeton subject headings:
Balkan Peninsula--History, Military.
Balkan Peninsula--History.
Christianity and other religions--Balkan Peninsula--Islam.
Islam--Balkan Peninsula--Relations--Christianity.