@misc{Keil_Christian_August_Karl_[Korespondencja,
 author={Keil, Christian August Karl},
 address={Pforta},
 howpublished={online},
 language={ger},
 type={text},
 title={[Korespondencja Friedricha Haasego - Haase 517]},
 keywords={Enrich Europeana Plus, correspondence},
}