<p>Plan of the fortified city of Casale Monferrato described by the source as
</p>
<dl><dd>0406:15:018:006 Plan de Casal.</dd></dl>
National Archives and the regional state archives of Sweden : <a rel="nofollow" class="external text" href="http://www.statensarkiv.se/default.asp?id=7764#Casale">0406e Utländska stads- och fästningsplaner, I - Tu</a>