@book{cbdu5600,
           title = {Extracte Vnterschiedlicher Particulir Schreiben: Das Kriegswesen in Pohlen und Preussen belangend. Anno 1656},
          number = {560},
         address = {[B. m. dr.]},
             url = {http://cbdu.ijp.pan.pl/id/eprint/5600/}
}