<i>El socialismo en Alemania</i>.
<bdi><a href="https://en.wikipedia.org/wiki/en:Manuel_Tovar" class="extiw" title="w:en:Manuel Tovar"><span title="Spanish cartoonist and caricaturist (1875–1935)">Manuel Tovar Siles</span></a>
</bdi>
<cite style="font-style:normal"> (<span class="mw-formatted-date" title="1910-12-17">1910-12-17</span>). "<a rel="nofollow" class="external text" href="http://hemerotecadigital.bne.es/issue.vm?id=0001575851&amp;page=1">El socialismo en Alemania</a>". <i><a href="https://www.wikidata.org/wiki/Q3327138" class="extiw" title="d:Q3327138">El Liberal</a></i>: 1. <a href="https://en.wikipedia.org/wiki/International_Standard_Serial_Number" class="extiw" title="en:International Standard Serial Number">ISSN</a> <a rel="nofollow" class="external text" href="https://www.worldcat.org/issn/2174-6648">2174-6648</a>.</cite>