code: def add_self_source(self):
          
          return self.add_source(
              bibcode=self.catalog.OSC_BIBCODE,
              name=self.catalog.OSC_NAME,
              url=self.catalog.OSC_URL,
              secondary=True)
docs: Add a source that refers to the catalog itself.
  
          For now this points to the Open Supernova Catalog by default.