<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.van-ham.com/datenbank-archiv/datenbank/carl-maria-nicolaus-hummel/dammmuehle-bei-friedrichsroda-in-thueringen.html">Van Ham Kunstauktionen, 30 January 2013, lot 831</a>