@misc{Tromnau_Friedrich_Geschichte,
 author={Tromnau, Friedrich},
 howpublished={online},
 publisher={Breitkopf & Härtel},
 language={ger},
 title={Geschichte des Deutschen Ritterordens},
 type={książka},
 keywords={Prusy - historia, Zakon Krzyżacki - historia},
}