@misc{Knackfuss_Hermann_(1848-1915)_Franz,
 author={Knackfuss, Hermann (1848-1915)},
 address={Bielefeld},
 address={Leipzig},
 howpublished={online},
 publisher={Velhagen und Klasing},
 language={ger},
 type={książka},
 title={Franz Hals},
 keywords={Hals, Frans (1582 lub 1583-1666), Malarstwo holenderskie, Malarze holenderscy},
}