"Sr. Conde de Esteban Collantes", en la revista <i>Summa</i>.
<bdi><a href="https://en.wikipedia.org/wiki/en:Kaulak" class="extiw" title="w:en:Kaulak"><span title="Spanish photographer">Kaulak</span></a>
</bdi>
<cite style="font-style:normal"> (<span class="mw-formatted-date" title="1916-02-15">1916-02-15</span>). "Conde de Esteban Collantes". <i>Summa (Año II)</i> (IV): 43. <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/1888-8240">1888-8240</a>.</cite>