@misc{Kauffeldt_Alfons_Nikolaus,
 author={Kauffeldt, Alfons},
 copyright={Kauffeldt, Alfons},
 address={Leipzig},
 address={Jena},
 howpublished={online},
 publisher={Urania-Verlag},
 language={ger},
 type={książka},
 title={Nikolaus Kopernikus : der Umsturz des mittelalterlichen Weltbildes},
}