@misc{Dittrich_Franz_(1839-1915)_Die,
 author={Dittrich, Franz (1839-1915)},
 address={[Köln]},
 howpublished={online},
 publisher={[J. P. Bachem]},
 language={ger},
 type={książka},
 title={Die mittelalterliche Kunst im Ordenslande Preußen},
}