The Labour Code Law of 26 June 1974 as ammended in 1975, 1981, 1982, 1985, 1986, 1987, 1988, 1989 and 1990 (excerpts). Part II. Individual Employment Relationship. CC&EEL [Internet]. 1990 Dec. 31 [cited 2025 Oct. 6];(2(86):77-91. Available from: https://czasopisma.inp.pan.pl/index.php/cceel/article/view/1285