Popp, L.E. (2010) „The labour market and the social approach of unemployment”, Revista de Cercetare si Interventie Sociala, 28, pp. 115–123. Disponibil la: https://www.rcis.ro/journal/article/view/297-the-labour-market-and-the-social-approach-of-unemployment (Data accesării: 7 noiembrie 2026).