Then Again
Then Again: Web Chron: First Balkan War 1912 1913
A brief description of why the Balkan war started along with some important dates during the year.
Other
War at the Crossroads: The Emergence of Nationalism
This site contains information about nationalism in the Balkans from the early 1900's to the present.
World War 1
Worldwar1.com: Trenches on the Web: War Atlas: The Balkans 1914
Contains a map of the Balkans, a list of the countries there, and their political positions in World War I.