diff --git a/_includes/footer.html b/_includes/footer.html
index 0a7aefe..ad368f0 100644
--- a/_includes/footer.html
+++ b/_includes/footer.html
@@ -22,7 +22,7 @@
       <div>{% include logo-hd-iibicrit-grises-footer.svg %}</div>
     </a>
   </br>
-    <span> {{ site.time | date: '%Y' }} {{ site.title | escape }}. ISSN 1668-0001. CC BY 4.0</span>
+    <span> {{ site.time | date: '%Y' }} {{ site.title | escape }}. <a href="https://n2t.net/ark:/69774/hda2015">https://n2t.net/ark:/69774/hda2015</a>. ISSN 1668-0001. CC BY 4.0</span>
   </div>
 </footer>
 <script async src="{{ "/assets/js/bundle.js" | relative_url }}"></script>