<bdi><a href="https://en.wikipedia.org/wiki/en:Robert_Koehler" class="extiw" title="w:en:Robert Koehler"><span title="German-born painter and art teacher (1850-1917)">Robert Koehler</span></a>
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circa 1902 <div style="display: none;">date QS:P571,+1902-00-00T00:00:00Z/9,P1480,Q5727902</div>
<p>1. <a rel="nofollow" class="external text" href="http://www.artsconnected.org/toolkit/encyc_colormood.html">artsconnected.org</a><br>2. <a rel="nofollow" class="external text" href="http://amica.davidrumsey.com/luna/servlet/detail/AMICO~1~1~99302~105993">The AMICA Library</a>
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3. <a rel="nofollow" class="external text" href="http://www.artsconnected.org/toolkit/encyc_colormood.html">artsconnected.org</a><br>4. <a rel="nofollow" class="external text" href="https://collections.artsmia.org/index.php?page=detail&amp;id=303">Minneapolis Institute of Arts, online collection</a>