Law of March 29-th 1963 on Foreigners: Dz.U. Nr 15, poz 77. Contemporary Central & East European Law, [S. l.], n. 7-8, p. 118–121, 1967. Disponível em: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1755. Acesso em: 22 mar. 2026.