Portrait of Adolf Tobler, from 1860 to 1890.
<bdi><a href="https://www.wikidata.org/wiki/Q29554378" class="extiw" title="d:Q29554378"><span title="German photographic studio (1862–1896)">Loescher &amp; Petsch</span></a>
</bdi>
Archivio storico dell'Accademia delle Scienze - <a rel="nofollow" class="external text" href="https://www.accademiadellescienze.it/accademia/soci/adolf-tobler">Catalogo digitale</a>