Help with Blog's template

[Sovereign Grace Singles]

I need to put a script in the head or preferably before the closing html body tags on every blog page.  I do not want to use the global template which would insert the script throughout the entire website. Which template would I insert the below script for just blogs:

<script>
      var refTagger = {
           settings: {
                bibleVersion:     "ESV"   
           }  
      };
      (function(d, t) {
           var g = d.createElement(t), s = d.getElementsByTagName(t)[0];
           g.src = ' ∕∕api.reftagger.com/v2/RefTagger.js';
           s.parentNode.insertBefore(g, s);
      }(document,     'script'));
 </script>