@Article{397904,
     author = "Władysław Piwowarski",
     title = "Social principles in John Paul's II encyclical "Laborem exercens"",
     year =  1983,
     volume =  53,
     number =  Fasciculus specialis,
     journal =  Collectanea Theologica,
     pages =  s. 61-78,
    }