@misc{Keil_Heinrich_[Korespondencja,
 author={Keil, Heinrich},
 address={Halle},
 howpublished={online},
 language={ger},
 type={text},
 title={[Korespondencja Friedricha Haasego - Haase 519]},
 keywords={Enrich Europeana Plus, correspondence},
}