@Article{530300,
     author = "Łukasz Tomczak",
     title = "Leaders of Polish Political Parties and Their Scope of Power in Party Structures",
     year =  2015,
     volume =  11,
     number =  ,
     journal =  Preferencje Polityczne : postawy, identyfikacje, zachowania,
     pages =  s. 7-17,
    }