Editors. "Diet of Ratisbon confirms the Peace of Westphalia". The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16379, accessed 17 April 2014.]
Holy Roman Emperor Ferdinand III holds a Diet of Ratisbon, which confirms the arrangements detailed by the 1648 Peace of Westphalia.