Colloque polono-yougoslave sur les aspects juridiques des voyages (Belgrade, 16-22 mai 1976). Contemporary Central & East European Law, [S. l.], n. 1 (33), p. 63–64, 1977. Disponível em: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1459. Acesso em: 6 oct. 2025.