<i>Geschichte der Photographie in Bildern</i>, Tafel 9: Alphonse Poitevin (1819–1882), französischer Chemiker und Ingenieur
<bdi><a href="//commons.wikimedia.org/wiki/Category:19th-century_unidentified_photographers" title="Category:19th-century unidentified photographers">Unidentified photographer</a>
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CC BY-SA 4.0
<bdi><a href="https://en.wikipedia.org/wiki/en:Heidelberg_University_Library" class="extiw" title="w:en:Heidelberg University Library"><span title="central scientific library providing literature and information for the whole University of Heidelberg, Germany">University Library Heidelberg</span></a>
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