<i>Copy of emblem of school of Leonardo da Vinci</i>
<bdi><a href="https://en.wikipedia.org/wiki/en:Albrecht_D%C3%BCrer" class="extiw" title="w:en:Albrecht Dürer"><span title="German painter, printmaker, mathematician, and theorist">Albrecht Dürer</span></a>
</bdi>
between 1506 and 1507 <div style="display: none;">date QS:P571,+1506-00-00T00:00:00Z/8,P1319,+1506-00-00T00:00:00Z/9,P1326,+1507-00-00T00:00:00Z/9</div>
scanned from: <i>Leonardo da Vinci, Artysta i dzieło</i>, red.: D. Dzierżanowska, wyd. Arkady, Warszawa 2005, <a href="//commons.wikimedia.org/wiki/Special:BookSources/83-213-4419-4" title="Special:BookSources/83-213-4419-4">ISBN 83-213-4419-4</a>