@misc{Haack_Friedrich_(1868-1927)_Die,
 author={Haack, Friedrich (1868-1927)},
 howpublished={online},
 publisher={Paul Neff Verlag (Max Schreiber)},
 language={ger},
 type={książka},
 title={Die Kunst des XIX. Jahrhunderts},
 keywords={sztuka, 19 w.},
}