@Article{592901,
     author = "Elena Lavrentsova, Petar Valkov",
     title = "Dropping out of School : Risk and Protective Factors = Porzucenie szkoły : ryzyko i czynniki ochronne ",
     year =  2017,
     volume =  5,
     number =  ,
     journal =  Labor et Educatio,
     pages =  s. 107-124,
    }