Titelblatt der "Chronica Monasterij Ysnensis"
Unknown author<span style="display: none;">Unknown author</span>
<i>Reichsabtei St. Georg in Isny 1096–1802</i>, 1996, <a href="//commons.wikimedia.org/wiki/Special:BookSources/3-87437-386-X" title="Special:BookSources/3-87437-386-X">ISBN 3-87437-386-X</a>