S 81
      Staboulis,M.
      Social and economic aspects of recognition and validation of non-formal adult learning system in Greece M. Staboulis, I. Lazaridou, L. Boutskou // Journal of European economy. - 2020. - Vol. 19 № 4(Березень). - С. 633-659. - .
УДК 331.101.262(495)