@misc{_[Żuławy,
 address={[Berlin]},
 howpublished={online},
 publisher={Kartogr. Abtheilung der Kgl. Preuss. Landes-Aufnahme},
 language={ger},
 title={[Żuławy Wiślane]},
 type={mapa},
 keywords={Żuławy Wiślane},
}