Wacław Szubert, Ubezpieczenia społeczne. Zarys systemu [L’assurance sociale. Précis d’un systéme], Warszawa 1987, PWN, 335 pages. Contemporary Central & East European Law, [S. l.], n. 1-4(81-84), p. 73–76, 1989. Disponível em: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1321. Acesso em: 6 oct. 2025.