Change cite_d to cite_details

lib/jekyll/scholar/tags/cite_details.rb

@@ -23,4 +23,4 @@ module Jekyll
   end
 end
 
-Liquid::Template.register_tag('cite_d', Jekyll::Scholar::CiteDetailsTag)
+Liquid::Template.register_tag('cite_details', Jekyll::Scholar::CiteDetailsTag)

lib/jekyll/scholar/utilities.rb

@@ -84,7 +84,9 @@ module Jekyll
         entry = bibliography[key]
       
         if bibliography.key?(key)
-          link_to "More details.", details_link_for(entry)
+          link_to details_link_for(entry), "More details."
+        else
+          "(missing reference)"
         end
       end