@misc{_Extrablatt,
 howpublished={online},
 publisher={Merzbach, Ludwik},
 language={ger},
 language={pol},
 type={gazeta},
 title={Extrablatt zum Kreisblatt des Kreises Posen-West 1917.08.11 Jg.29 Nr53},
 keywords={czasopisma niemieckie, powiat poznański zachodni, Posen-West, Kreis Posen-West},
}