@Article{612900,
     author = "Katarzyna Żak",
     title = "The diagnosis of the use of social media in building an enterprise’s relationships with customers: Poland and the European Union",
     year =  2016,
     volume =  10,
     number =  ,
     journal =  Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Pragmata tes Oikonomias,
     pages =  s. 143-156,
    }