@misc{Wutke_Konrad_(1861-1951)_Über,
 author={Wutke, Konrad (1861-1951)},
 howpublished={online},
 publisher={Ferdinand Hirt (Wrocław)},
 language={Polish},
 title={Über schlesische Formelbücher des Mittelalters},
 type={book},
 keywords={Silesia, Middle Ages, historical sources},
}