Editors. "The Protestant Princes of Germany meet at Ulm". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14343, accessed 17 April 2014.]
The Protestant Princes of Germany meet at Ulm, as they are to do again at Speyer in December, to organise a military campaign against the Emperor Charles V.