Editors. "Treaty between Turkey and the Empire reduces the power of Transylvania". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15967, accessed 20 May 2013.]
The Ottoman Turks and Holy Roman Emperor Ferdinand II sign a treaty aimed at reducing the power of Gabor Bethlen, Prince of Transylvania .