@misc{Bertholdi_H._Danziger,
 author={Bertholdi, H.},
 howpublished={online},
 publisher={Verlag von B. Kabus},
 language={ger},
 type={książka},
 title={Danziger Stech-Aepfel},
 keywords={19 w., Gdańsk (Polska)},
}