• Letter of Bishop Josip Juraj Strossmayer to Mr. William E. Gladstone, February 13, 1878 posted by Habsburg Web  
• The Three Emperors' League, Jan. 18th 1881, from Avalon Project, Yale Univ. with reference to Bulgaria, Eastern Rumelia  
• Treaty of Berlin between Great Britain, Austria-Hungary, France, Germany, Italy, Russia and Turkey, July 13, 1878, excerpt, posted by ANN (the Armenian News Network)  
• The Treaty of Berlin, 1878, Excerpts on the Balkans, from Modern History Sourcebook
• The Greek Army and Bulgarian Peasants During the Second Balkan War, Source: The Carnegie Endowment for International Peace, Report of the International Commission to Inquire into the Causes and Conduct of the Balkan Wars (Washington, DC: The Endowment, 1914). posted by Habsburg Web  
• The Bulgarian Declaration of Independence, 1908, Source: Anderson, Frank Maloy and Amos Shartle Hershey, Handbook for the Diplomatic History of Europe, Asia, and Africa 1870-1914. Prepared for the National Board for Historical Service. Government Printing Office, Washington, 1918. posted by V. Ferraro, Mt. Holyoke  
• Bernard Grant: The Flight of the Turks from Lule-Burgas, 1912, from: Modern History Sourcebook  
• Tsar Nicholas' Declaration Against the Bulgarians, English translation from World War I Document Archive    

• Nordwestdeutsche Zeitung vom 18. Oktober 1912: Krieg auf dem Balkan
• The Formation of the Balkan Alliance of 1912, Source: Handbook 1918 (1)  
• The Efforts of the Powers to Prevent the Outbreak of the First Balkan War, Source: Handbook 1918 (1)  
• Treaty of Peace between Greece, Bulgaria, Montenegro, Serbia on the one part and Turkey on the other part, London, May 17/30, 1913
• The Effort to Prevent Outbreak of the Second Balkan War, 1913, Source: Handbook 1918 (1)
• The Treaty of London, 1913, Source: Handbook 1918 (1)
• Treaty of Peace between Roumania, Greece, Montenegro, Serbia, and Bulgaria, Bucharest, July 28/August 10, 1913
• The Treaty of Bucharest, August 10, 1913, Source: Handbook 1918 (1)
• The Treaty of Constantinople, 1913, Source: Handbook 1918 (1)

(1): Anderson, Frank Maloy and Amos Shartle Hershey, Handbook for the Diplomatic History of Europe, Asia, and Africa 1870-1914. Prepared for the National Board for Historical Service. Government Printing Office, Washington, 1918. posted by Mt. Holyoke

• "The Peace of Bucharest"--The Treaty of Peace between Roumania and the Central Powers. Signed At Bucharest, 7 May, 1918, posted by V. Ferraro, Mt. Holyoke

• 1918: Report on War Guilt by the 'Commission on the Responsibility of the Authors of the War', from World War I Document Archive

• Paris Peace Conference, July 29 to October 15, 1946, Report by Secretary Byrnes, October 18, 1946, from: from Avalon Project, Yale Univ.
• Treaty of Peace with Bulgaria, Paris, 10 February 1947, from: Australian Treaty Series