<i>Geschichte der Photographie in Bildern</i>, Tafel 3: John Frederick William Herschel (1792–1871), englischer Astronom und Physiker
<bdi><a href="https://en.wikipedia.org/wiki/en:Julia_Margaret_Cameron" class="extiw" title="w:en:Julia Margaret Cameron"><span title="British photographer (1815–1879)">Julia Margaret Cameron</span></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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