Loi du fèvrier 1961 sur les cooperatives et leurs unions: Dz.U. P.R.L., 1961, Nr 12, poz 61. Contemporary Central & East European Law, [S. l.], n. 14, p. 61–66, 1970. Disponível em: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1568. Acesso em: 6 oct. 2025.