@book{cbdu14980,
           title = {Extr{\'a}ordyn{\'a}ryine z Poczty Ces{\'a}rskiey wi{\'a}domo{\'s}{\'c}i. z Kr{\'a}kow{\'a} 6. Septembris 1687. },
         address = {Krak{\'o}w},
          number = {1498},
             url = {http://cbdu.ijp.pan.pl/id/eprint/14980/}
}