@misc{Treitschke_Heinrich_Das,
 author={Treitschke, Heinrich},
 howpublished={online},
 publisher={Insel-Verlag},
 language={ger},
 title={Das deutsche Ordensland Preussen},
 type={książka},
 keywords={Prusy - historia, Zakon Krzyżacki - historia, Treitschke, Heinrich von (1834-1896)},
}