@book{cbdu2060,
           title = {Sigismundi III, electi Poloniae regis, Cracoviam ingressus},
         address = {Krak{\'o}w},
       publisher = {Jakub Siebeneycher},
          number = {206},
             url = {http://cbdu.ijp.pan.pl/id/eprint/2060/}
}