@misc{Opaliński_Łukasz_(1612-1662)_Polonia,
 author={Opaliński, Łukasz (1612-1662)},
 howpublished={online},
 publisher={Sumptibus Georgii Försteri [...]},
 language={lat},
 title={Polonia Defensa Contra Ioann. Barclaivm, Vbi, occasione ista, de Regno Genteque Polona multa narrantur, hactenus litteris non tradita.},
 type={stary druk},
}