@misc{Grotefend_Karl_Otto_(1873-1945)_Mecklenburger,
 author={Grotefend, Karl Otto (1873-1945)},
 howpublished={online},
 publisher={Bärensprungschen Hofbuchdruckerei},
 publisher={Schwerin i M.},
 language={ger},
 type={książka},
 title={Mecklenburger in Danzig},
}