docs: def references_to_json(resources, references):
      """ Make a JSON/catalog representation of the references db,
       including the count for each """
  
      dump_references = {}
      for reftype, refvalue in references.items():
          dump_references[reftype] = {}
          for label, reference_resource in refvalue.items():
              target_count = len(reference_resource.get_sources(resources))
              dump_references[reftype][label] = dict(
                  count=target_count,
                  docname=reference_resource.docname
              )
  
      return dump_references