<div class="fn value">
Unknown<span style="display: none;">Unknown </span> (Northern Italy)</div>
Scan from book Battistini, Bildlexikon der Kunst, Bd. 1, Berlin: Parthas-Verlag, 2003, <a href="//commons.wikimedia.org/wiki/Special:BookSources/3-936324-00_X" title="Special:BookSources/3-936324-00 X">ISBN 3-936324-00 X</a>, S. 24