Columbia subject headings:
Islamic Empire--History.
Turkey--Civilization.
Turkey--History--To 1453.
Turkic peoples--History.
Harvard subject headings:
Islamic Empire--History.
Turkey--Civilization--History.
Turkey--History--To 1453.
Turkic peoples--History
Princeton subject headings:
Islamic Empire--History.
Turkey--Civilization.
Turkey--History--To 1453.
Turkic peoples--History.