Columbia subject headings:
Balkan Peninsula--History--War of 1912-1913.
Europe--Armed Forces.
Europe--Politics and government--1871-1918.
World War, 1914-1918--Causes.
Harvard subject headings:
Balkan Peninsula--History--War of 1912-1913.
Europe--Armed Forces.
Europe--Politics and government--1871-1918.
World War, 1914-1918--Causes
Princeton subject headings:
Eastern question (Balkan)
Germany--Foreign relations--Turkey.
Turkey--Foreign relations--Germany.