def dns_resource_reference(self):
        """Instance depends on the API version:

           * 2018-05-01: :class:`DnsResourceReferenceOperations<azure.mgmt.dns.v2018_05_01.operations.DnsResourceReferenceOperations>`
        """
        api_version = self._get_api_version('dns_resource_reference')
        if api_version == '2018-05-01':
            from .v2018_05_01.operations import DnsResourceReferenceOperations as OperationClass
        else:
            raise NotImplementedError("APIVersion {} is not available".format(api_version))
        return OperationClass(self._client, self.config, Serializer(self._models_dict(api_version)), Deserializer(self._models_dict(api_version)))
Instance depends on the API version:

           * 2018-05-01: :class:`DnsResourceReferenceOperations<azure.mgmt.dns.v2018_05_01.operations.DnsResourceReferenceOperations>`