@misc{Humboldt_Alexander_von_(1769-1859)_Brief,
 author={Humboldt, Alexander von (1769-1859) and Encke, Johann Franz (1791-1865) [vermutlich]},
 howpublished={online},
 language={ger},
 title={Brief von Alexander von Humboldt an Johann Franz Encke},
 type={rękopis},
 keywords={rękopisy},
}