Columbia subject headings:
Istanbul (Turkey)--History--Siege, 1453.
Mehmed II, Sultan of the Turks, 1432-1481.
Turkey--History--1453-1683.
Harvard subject headings:
Mehmed II, Sultan of the Turks, 1432-1481.
Turkey--History--1453-1683.
Princeton subject headings:
Istanbul (Turkey)--History--Siege, 1453.
Mehmed II, Sultan of the Turks, 1432-1481.
Turkey--History--1453-1683.