Editors. "The Schmalkaldic League loses important members". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14495, accessed 13 December 2013.]
The Schmalkaldic League faces a crisis when three members - the Electors of Trier and the Palatinate and Philip, Landgrave of Hesse - briefly refuse to renew their membership.