Tadeusz Zieliński, Klauzule generalne w prawie pracy [Les clauses générales en droit du travail], Warszawa 1988, PWN, 298 pages. Contemporary Central & East European Law, [S. l.], n. 1(85), p. 77–81, 1990. Disponível em: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1292. Acesso em: 6 oct. 2025.