@book{cbdu15020,
         address = {Krak{\'o}w},
           title = {Extr{\'a}ordyn{\'a}ryine z Poczty Ces{\'a}rskiey wiadomo{\'s}ci. z Kr{\'a}kow{\'a} 4ta. Octobris 1687. },
          number = {1502},
             url = {http://cbdu.ijp.pan.pl/id/eprint/15020/}
}