@misc{Villefranche_Jacques_Melchior_(1829-1904)_Pius,
 author={Villefranche, Jacques Melchior (1829-1904)},
 address={Warszawa},
 howpublished={online},
 publisher={F. Czerwiński i S. Niemiera},
 language={pol},
 title={Pius IX},
 type={książka},
}