<bdi><a href="https://en.wikipedia.org/wiki/en:Carl_Hummel" class="extiw" title="w:en:Carl Hummel"><span title="German painter (1821-1907)">Carl Hummel</span></a>
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<a rel="nofollow" class="external text" href="http://www.arcadja.com/auctions/de/hummel_carl_maria_nicolaus/kunstler/41150/">Karl &amp; Faber, 30 November 2007, lot 141 via ARCADJA auction results</a>