@misc{Hagen_Ernst_August_(1797-1880)_Wilhelm,
 author={Hagen, Ernst August (1797-1880)},
 address={[s.l.]},
 howpublished={online},
 publisher={[s.n.]},
 language={ger},
 title={Wilhelm von Kaulbach : Vortrag am 23. April 1874 gehalten},
 type={broszura},
}