Editors. "John Sigismund Zapolya of Transylvania dies". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15120, accessed 18 April 2014.]
On the death of John Sigismund Zapolya of Transylvania, the Emperor Maximilian II acquires the prince's possessions in Hungary, but the estates of Transylvania elect Stephen Bathory as their Voivode.