@misc{Helwig_Martin_(1516-1574)_M.,
 author={Helwig, Martin (1516-1574)},
 address={Breslau},
 howpublished={online},
 publisher={Baumannowie, Dziedzice},
 publisher={Straubel, Johann Gottlieb (1677-1753)},
 language={ger},
 language={lat},
 title={M. Martin Helwigs Erste Land=Charte vom Herzogthum Schlesien},
 keywords={16 w., Śląsk, mapy, kartografia, drzeworyty, Rübezahl},
}