“Wacław Szubert, Ochrona Pracy. Studium społeczno-Prawne. [Protection of Labour. Sociological-Legal Study], Warszawa 1966, PWN”. Contemporary Central & East European Law, no. 9, Dec. 1968, pp. 33-34, https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1767.