<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>
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1. Unknown source<span style="display: none;">Unknown source</span><br>2. <a rel="nofollow" class="external text" href="http://www.arcadja.com/auctions/en/private/blechen_karl/artworks/2827/0/">Sotheby's via Arcadja auctions results</a><br>3. <a rel="nofollow" class="external text" href="http://www.sothebys.com/de/auctions/ecatalogue/2009/19th-century-european-paintings-including-spanish-painting-the-orientalist-sale-and-german-austrian-scandinavian-and-symbolist-works-l09663/lots.list.0.html">Sotheby's London, 24 November 2009, L09663</a>, <a rel="nofollow" class="external text" href="http://www.sothebys.com/content/dam/stb/lots/L09/L09663/L09663-4-lr-1.jpg">lot 4 (page no more available)</a>