French sociologist Gustave Le Bon (1841-1931)
Unknown author<span style="display: none;">Unknown author</span>
Late 19th or very early 20th century
<a rel="nofollow" class="external autonumber" href="http://www.laeditorialvirtual.com.ar/Pages/LeBon/LeBon_PsicologiaDeLasMasas.htm">[1]</a>