<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.dorotheum.com/en/fr/auction-detail/auction-9954-dessins-gravures-jusquen-1900-aquarelles-et-miniatures/lot-1486391-carl-maria-nicolaus-hummel.html?no_cache=1&amp;offset=3&amp;cHash=fc2d06b1c1408b32730795445e7f45fe">Dorotheum 24 April 2013, lot 305</a>