@misc{Keckerbart_Jan_De,
 author={Keckerbart, Jan},
 howpublished={online},
 publisher={wydawca nieznany},
 language={łacina},
 type={stary druk},
 title={De Reductione Monetali. Quæstio. An ill sit idoneus monetæ Regni},
 keywords={stary druk, Gdańsk},
}