<bdi><a href="https://en.wikipedia.org/wiki/en:Charles_Frederic_Ulrich" class="extiw" title="w:en:Charles Frederic Ulrich"><span title="American art painter (1858-1908)">Charles Frederic Ulrich</span></a>
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<a href="https://en.wikipedia.org/wiki/Christie%27s" class="extiw" title="en:Christie's">Christie's</a>, LotFinder:  <a rel="nofollow" class="external autonumber" href="https://www.christies.com/LotFinder/lot_details.aspx?intObjectID=">[1]</a> (sale 17035, lot 175, New York (Online), 15 - 22 May 2019, page no more available)