Columbia subject headings:
Balkan Peninsula--Civilization.
Dervishes.
Islam.
Harvard subject headings:
Bayezid II, Sultan of the Turks, 1447 or 1448-1512.
Dervishes.
Europe--Relations--Turkey.
Islam.
Turkey--Relations--Europe.
Princeton subject headings:
Balkan Peninsula--Civilization.
Dervishes.
Islam.