LEMPERTAS, Izraelis. Education and Labour. Problemos, [S. l.], v. 1, p. 81–89, 1968. DOI: 10.15388/Problemos.1968.1.5708. Disponível em: https://www.zurnalai.vu.lt/problemos/article/view/5708. Acesso em: 19 jan. 2026.