<bdi><a href="https://en.wikipedia.org/wiki/en:Karol_D._Witkowski" class="extiw" title="w:en:Karol D. Witkowski"><span title="Polish-American artist">Karl Witkowski</span></a>
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<a rel="nofollow" class="external text" href="http://www.sothebys.com/de/auctions/ecatalogue/2012/american-paintings-n08828/lot.33.html">Sotheby's New York, 05 April 2012, lot 33</a>