docs: def subjects_list(self, api_url=None, offset=0, limit=-1, properties=None):
          """Get list of subject resources from a SCO-API.
  
          Parameters
          ----------
          api_url : string, optional
              Base Url of the SCO-API. Uses default API if argument not present.
          offset : int, optional
              Starting offset for returned list items
          limit : int, optional
              Limit the number of items in the result
          properties : List(string)
              List of additional object properties to be included for items in
              the result
  
          Returns
          -------
          List(scoserv.ResourceHandle)
              List of resource handles (one per subject in the listing)
          """
          # Get subject listing Url for given SCO-API and return the retrieved
          # resource listing
          return sco.get_resource_listing(
              self.get_api_references(api_url)[sco.REF_SUBJECTS_LIST],
              offset,
              limit,
              properties
          )