<a href="https://en.wikisource.org/wiki/fr:Livre:Arago_-_Astronomie_populaire,_tome_2.djvu" class="extiw" title="s:fr:Livre:Arago - Astronomie populaire, tome 2.djvu">Livre:Arago - Astronomie populaire, tome 2</a>
<bdi><a href="https://en.wikipedia.org/wiki/en:Fran%C3%A7ois_Arago" class="extiw" title="w:en:François Arago"><span title="French mathematician, physicist, astronomer and politician (1786-1853)">François Arago</span></a>
</bdi>
Bibliothèque nationale de France