def get_last_name_first_name(self):
        """
        :rtype: str
        """
        last_names = []
        if self._get_last_names():
            last_names += self._get_last_names()
        first_and_additional_names = []
        if self._get_first_names():
            first_and_additional_names += self._get_first_names()
        if self._get_additional_names():
            first_and_additional_names += self._get_additional_names()
        if last_names and first_and_additional_names:
            return "{}, {}".format(
                helpers.list_to_string(last_names, " "),
                helpers.list_to_string(first_and_additional_names, " "))
        elif last_names:
            return helpers.list_to_string(last_names, " ")
        elif first_and_additional_names:
            return helpers.list_to_string(first_and_additional_names, " ")
        else:
            return self.get_full_name()
:rtype: str