Editors. "Henry IV urges German Protestant princes to join an attack on the Spanish Netherlands". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15508, accessed 19 May 2013.]
Henry IV calls on the Protestant princes of Germany to join France and the United Provinces in a concerted attack on the Spanish Netherlands.