@misc{Töppen_Max_(1822-1893)_Beiträge,
 author={Töppen, Max (1822-1893)},
 address={Danzig},
 howpublished={online},
 publisher={Th. Bertling},
 language={ger},
 type={książka},
 title={Beiträge zur Geschichte des Weichseldeltas},
}