<a href="https://en.wikisource.org/wiki/it:Indice:Ardigo_-_Scritti_vari.djvu" class="extiw" title="s:it:Indice:Ardigo - Scritti vari.djvu">s:it:Indice:Ardigo - Scritti vari.djvu</a>
<bdi><a href="https://en.wikipedia.org/wiki/en:Roberto_Ardig%C3%B2" class="extiw" title="w:en:Roberto Ardigò"><span title="Italian philosopher (1828-1920)">Roberto Ardigò</span></a>
</bdi>
Bibliothèque nationale de France