Columbia subject headings:
Harvard subject headings:
Christianity and other religions--Islam--History.
Church history--Middle Ages, 600-1500
Church history--Modern period, 1500-
Crusades.
Europe--History--1648-1715.
Islam--Relations--Christianity--History.
Islamic Empire--History--1258-1517.
Turkey--History--Ottoman Empire, 1288-1918.
Vienna (Austria)--History--Siege, 1683.
Princeton subject headings:
Christianity--Relations--Islam--History.
Europe--History--1648-1715.
Islam--Relations--Christianity--History.
Turkey--History--Ottoman Empire, 1288-1918.
Vienna (Austria)--History--Siege, 1683.