Portrait of Charles-Emile Picard, before 1909.
<bdi><a href="https://en.wikipedia.org/wiki/en:Pierre_Petit_(photographer)" class="extiw" title="w:en:Pierre Petit (photographer)"><span title="French photographer (1831–1909)">Pierre Petit</span></a>
</bdi>
Archivio storico dell'Accademia delle Scienze - <a rel="nofollow" class="external text" href="https://www.accademiadellescienze.it/accademia/soci/charles-emile-picard">Catalogo digitale</a>