LITWIŃSKI, Michał. The Cost of the Social Welfare System as an Investment in Human Capital in Poland. Studia Oeconomica Posnaniensia, Poznan, Polska, v. 5, n. 10, p. 85–104, 2017. DOI: 10.18559/SOEP.2017.10.6. Disponível em: https://journals.ue.poznan.pl/soep/article/view/3740. Acesso em: 3 sep. 2026.