<div class=“row”>

 {% for author in site.authors %}
 <div class="basis obras-ciudad">
         <div class="container">
             <h2><a class="morel" href="{{ site.baseurl }}{{ author.url }}">{{ author.title }}</a></h2>
         </div>
         {% for book in site.books %}
         {% if book.author == author.title or book.author2 == author.title or book.author3 == author.title %}
         <div class="price">
           <div class="title"><h4><a href="{{ BASE_PATH }}{{ book.url }}">{{book.title}}</a></h4></div>
         </div>
         {% endif %}
         {% endfor %}
 </div>
{% endfor %}

</div>