Columbia subject headings:
Islamic sects--Turkey--History.
Sufism--Turkey--History.
Turkey--History--Ottoman Empire, 1288-1918.
Harvard subject headings:
Islamic sects--Turkey--History--19th century.
Sufism--Turkey--History--19th century.
Turkey--History--Ottoman Empire, 1288-1918.
Princeton subject headings:
Islam and state--Turkey--History.
Islamic sects--Turkey--History.
Sufism--Turkey--History.
Turkey--History--Ottoman Empire, 1288-1918.