@misc{N._P_Literæ,
 author={N. P},
 howpublished={online},
 publisher={[s.n.]},
 language={lat},
 type={stary druk},
 title={Literæ Ad Amicum : Quibus De Cl. Virorum J. Th. Kleinii & Jo. Phil. Breynii [...].},
}