@misc{Mercator_Gerard_(1512–1594)_Polonia_[post,
 author={Mercator, Gerard (1512–1594)},
 copyright={Public Domain},
 address={[S.l.]},
 howpublished={online},
 year={[post 1612]},
 publisher={[s.n.]},
 language={lat},
 title={Polonia et Silesia},
 keywords={chorographic maps, Poland, Silesia, 17th century},
}