@misc{Perlbach_Max_Die,
 author={Perlbach, Max},
 howpublished={online},
 publisher={Ferd. Beyer vorm. Theile`sche Buchhandlung},
 language={ger},
 title={Die ältesten preußischen Urkunden},
 type={książka},
 keywords={Prusy - historia, Zakon Krzyżacki - historia, biskupi},
}