@misc{Coler_Johann_(1566-1639)_Calendarium,
 author={Coler, Johann (1566-1639)},
 address={Wittenberg},
 howpublished={online},
 publisher={Helwig, Paul. Nakł.},
 language={ger},
 title={Calendarium perpetuum et Libri oeconomici},
 keywords={Kolekcje Piastowskie},
}