The Austro-Hungarian Declaration of War on Serbia
from: Collected Documents Relating to the Outbreak of the European War (London, 1915), p. 392. This is Document No. 45 quoted from the Serbian Blue Book.
"At 11:10 A.M. on July 28, 1914, Count Leopold von Berchtold, the Austro-Hungarian Minister for Foreign Affairs, sent the following telegram from Vienna to M. N. Pashitch, Serbian Prime Minister and Minister for Foreign Affairs. This declaration of war was received at Nish at 12:30 P.M."
Vienna, July 28, 1914
The Royal Serbian Government not having answered in a satisfactory manner
the note of July 23, 1914, presented by the Austro-Hungarian Minister at
Belgrade, the Imperial and Royal Government are themselves compelled to see
to the safeguarding of their rights and interests, and, with this object,
to have recourse to force of arms. Austria-Hungary consequently considers
herself henceforward in state of war with Serbia.