<script src="{% static 'contrib/leaflet.markercluster-1.4.1/leaflet.markercluster.js' %}"></script>
<script>
var map = L.map('references-map').setView([52, 20], 7);
<script src="{% static 'contrib/leaflet.markercluster-1.4.1/leaflet.markercluster.js' %}"></script>
<script>
var map = L.map('references-map').setView([52, 20], 7);