<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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<p>1. <a rel="nofollow" class="external text" href="http://americangallery.wordpress.com/category/witkowski-karl/">American Gallery, Greatest American Painters</a><br></p>
2. <a rel="nofollow" class="external text" href="http://www.invaluable.com/auction-lot/karl-witkowski,-american-1860-1910-,-one-for-tw-163-c-36db75a060">Shannon's, Milford, 29 April 2010, lot 163 via Invaluable</a>