A :class:`~google.cloud.bigquery.model.ModelReference` pointing to
        this model.

        Read-only.

        Returns:
            google.cloud.bigquery.model.ModelReference: pointer to this model.

def reference(self):
        """A :class:`~google.cloud.bigquery.model.ModelReference` pointing to
        this model.

        Read-only.

        Returns:
            google.cloud.bigquery.model.ModelReference: pointer to this model.
        """
        ref = ModelReference()
        ref._proto = self._proto.model_reference
        return ref