@misc{Helwig_Martin_(1516–1574)_Silesiae_[1633],
 author={Helwig, Martin (1516–1574) and Hondius, Henricus (1597–1651) and Janssonius, Joannes (1588–1664)},
 copyright={Copyright by Uniwersytet Wrocławski},
 copyright={University of Wroclaw},
 address={Amsterdam},
 howpublished={online},
 year={[1633]},
 publisher={Henricus Hondius},
 title={Silesiae Ducatus nova et accurata descriptio},
 keywords={17 w., kolekcja Romera, mapa ogólnogeograficzna, Śląsk},
}