@misc{Heweliusz_Jan_(1611-1687)_Johannis,
 author={Heweliusz, Jan (1611-1687)},
 howpublished={online},
 publisher={[s.n.]},
 language={lat},
 type={stary druk},
 title={Johannis Hevelii Epistola Ad Amicum, De Cometa, Anno M DC LXXVII Gedani observato},
 keywords={Johannes Hevelius},
}