@misc{_Imperium,
 address={Amstelodami},
 howpublished={online},
 publisher={Jansson Joannes},
 language={lat},
 type={mapa},
 title={Imperium Caroli Magni},
 keywords={Karol Wielki, Cesarstwo -- mapy -- 17 w, Europa -- mapy -- 8 w},
}