Stolle, H.
(2017).
 A cognition-based approach toward a general theory of map signs.
<em>Meta-Carto-Semiotics, 8</em>(1), 35-41.
Retrieved from <a href="http://ojs.meta-carto-semiotics.org/index.php/mcs/article/view/11" target="_new">http://ojs.meta-carto-semiotics.org/index.php/mcs/article/view/11</a>