<bdi><a href="https://en.wikipedia.org/wiki/en:Carl_Blechen" class="extiw" title="w:en:Carl Blechen"><span title="German painter (1798-1840)">Carl Blechen</span></a>
</bdi>
1. <a rel="nofollow" class="external free" href="https://purl.org/nga/collection/artobject/139108">https://purl.org/nga/collection/artobject/139108</a> <br>2. <a rel="nofollow" class="external text" href="https://www.nga.gov/collection/art-object-page.139108.html">National Gallery of Art, Washington, D. C., online collection</a>