code: def external(self, external_id, include=None):
          
          return self._query_zendesk(self.endpoint.external, 'organization', id=external_id, include=include)
docs: Locate an Organization by it's external_id attribute.
  
          :param include: list of objects to sideload. `Side-loading API Docs 
              <https://developer.zendesk.com/rest_api/docs/core/side_loading>`__.
          :param external_id: external id of organization