Here are just a few of the many titles available
British Documents on the Origins of the War 1898-1914
by
G.P. Gooch
Collected Diplomatic Documents Related to the Outbreak of the European War
by
Great Britain. Foreign Office.
Collected materials for the study of the war
by
Albert E. McKinley
Diplomatic documents relating to the outbreak of the European war
by
James Brown Scott
First World War A Docuemntary Record