@misc{Geyer_Albert_Die,
 author={Geyer, Albert},
 howpublished={online},
 publisher={Bernhard Franke},
 language={ger},
 title={Die Pioniere des Deutschtums im alten Preussenlande},
 type={książka},
 keywords={Prusy - historia, biografie, Zakon Krzyżacki - biografie},
}