@misc{Boehn_Max_von_(1860-1932)_Carl,
 author={Boehn, Max von (1860-1932)},
 address={Bielefeld},
 address={Leipzig},
 howpublished={online},
 publisher={Velhagen & Klasing},
 language={ger},
 type={książka},
 title={Carl Opitzweg},
}