@misc{Niger_Franciscus_Ars,
 author={Niger, Franciscus},
 howpublished={online},
 publisher={s.n.},
 language={lat},
 title={Ars scribendarum Epistolarum elegantissima},
 type={stary druk},
 keywords={Niger, Franciscus (1452-1496), listy łacińskie, sztuka pisania listów, retoryka, epistolografia},
}