Columbia subject headings:
World War, 1914-1918--Bulgaria.
World War, 1914-1918--Diplomatic history.
World War, 1914-1918--Italy.
World War, 1914-1918--Romania.
World War, 1914-1918--Russia.
World War, 1914-1918--Turkey.
Harvard subject headings:
World War, 1914-1918--Bulgaria
World War, 1914-1918--Diplomatic history
World War, 1914-1918--Italy.
World War, 1914-1918--Romania
World War, 1914-1918--Russia
World War, 1914-1918--Soviet Union
World War, 1914-1918--Turkey
Princeton subject headings:
World War, 1914-1918--Bulgaria.
World War, 1914-1918--Diplomatic history.
World War, 1914-1918--Italy.
World War, 1914-1918--Romania.
World War, 1914-1918--Soviet Union.
World War, 1914-1918--Turkey.