<bdi><a href="https://en.wikipedia.org/wiki/en:Caspar_David_Friedrich" class="extiw" title="w:en:Caspar David Friedrich"><span title="German painter">Caspar David Friedrich</span></a>
</bdi>
circa 1818-1820
1. <a rel="nofollow" class="external text" href="http://www.kunstmarkt.com/pages/wis/artlossreg_grossbildansicht.html?berichtid=56526&amp;bildid=56530&amp;bk=073_18">www.kunstmarkt.com </a><br> 2. <a rel="nofollow" class="external text" href="http://www.bildindex.de/">Bildindex der Kunst und Architektur</a>: object <a rel="nofollow" class="external text" href="https://www.bildindex.de/document/obj00040299"><i>00040299</i></a> – image file <a rel="nofollow" class="external text" href="http://www.bildindex.de/bilder/XKH141325a.jpg"><i>XKH141325a.jpg</i></a><br>3. <a href="https://en.wikipedia.org/wiki/en:Bridgeman_Art_Library" class="extiw" title="w:en:Bridgeman Art Library"><span title="library">Bridgeman Art Library</span></a>:  Object <a rel="nofollow" class="external text" href="https://www.bridgemanimages.co.uk/en/asset/141325">141325</a><br>