@misc{Barnickel_Johann_Christoph_Ducatus,
 author={Barnickel, Johann Christoph},
 address={Norimbergæ},
 howpublished={online},
 publisher={Homannowie, Dziedzice},
 language={fre},
 language={lat},
 title={Ducatus Curlandiae juxta Barnikelii Architecti Curici primarii Geometricam Delineationem Geographica Tabula expressus},
 keywords={mapy, 18 w., Łotwa, Inflanty, kartografia, Kurlandia},
}