<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.arcadja.com/auctions/de/private/witkowski__karl_karol/kunstwerken/30889/0/?rvn=2">Kamelot Auctions, Philadelphia, 13.06.2019, lot 31 via Arcadja auction results</a>