<bdi><a href="https://en.wikipedia.org/wiki/en:Christian_Ludwig_Bokelmann" class="extiw" title="w:en:Christian Ludwig Bokelmann"><span title="German painter">Christian Ludwig Bokelmann</span></a>
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Düsseldorfer Auktionshaus, <a href="https://en.wikipedia.org/wiki/D%C3%BCsseldorf" class="extiw" title="w:Düsseldorf">Düsseldorf</a>, 1 June 2013 <a rel="nofollow" class="external text" href="http://www.duesseldorfer-auktionshaus.de/en/katalog/view/01_2013">Lot 6</a>