<a href="//commons.wikimedia.org/wiki/Bernard_Bolzano" title="Bernard Bolzano">Bernard Bolzano</a>
The original uploader was <a href="https://en.wikipedia.org/wiki/cs:User:Petrus" class="extiw" title="w:cs:User:Petrus">Petrus</a> at <a href="https://en.wikipedia.org/wiki/cs:" class="extiw" title="w:cs:">Czech Wikipedia</a>.
1 October 2003 (original upload date)
Transferred from <span class="plainlinks"><a class="external text" href="https://cs.wikipedia.org">cs.wikipedia</a></span> to Commons.