<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="https://www.johnmoran.com/catalog/product/karl-witkowski-18601910-newark-nj-43-1-1MD00Z/?Catalogue_ID=65">John Moran Auctioneers, Los Angeles, 09.04.2019, lot 43</a>