@Article{395796,
     author = "Władysław Kobyliński",
     title = "The Organizational Roles of the School Principal : a Study in Management Strategies",
     year =  1988,
     volume =  22,
     number =  ,
     journal =  Annales Universitatis Mariae Curie-Skłodowska. Sectio H, Oeconomia,
     pages =  s. 257-268,
    }