@misc{Sleidanus_Joannes_(1506-1556)_De,
 author={Sleidanus, Joannes (1506-1556)},
 howpublished={online},
 publisher={excudebat Ioasias Rihelius},
 language={lat},
 title={De quatuor summis imperiis libri tres [...]},
 type={starodruk},
 keywords={historia, cesarstwo},
}