Editors. "Prussia, Russia and Austria agree to support the Ottoman Empire". The Literary Encyclopedia. First published 30 December 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17996, accessed 17 April 2014.]
At a meeting in Berlin, the powers of Prussia, Russia and Austria agree to support the integrity of the Ottoman Empire. They seek to further the Holy Alliance by promising to aid one another in the event of attack.