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| | http://hdl.handle.net/1887.1/item:1907498| Engelmann, Theodor Wilhelm (1843-1909)| [{Image src='https://www.austria-forum.org/cc/images/slim/by.png' alt='CC BY 4.0' align='center' link='https://www.austria-forum.org/cc/by-40.html' target='_blank'}]| Datei:Brief van Theodor Wilhelm Engelmann (1843-1909) aan Nicolaas Beets (1814-1903) LTK BEETS A 1.pdf
| Theodor Wilhelm Engelmann (1843-1909), deutscher Physiologe, Biologe und Zoologe| Universität Utrecht| Johan Coenraad Ulrich Legner (1859 - 1932)| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Theodor-Wilhelm-Engelmann.jpg
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