@misc{Roth_Justus_(1818-1892)_Ueber,
 author={Roth, Justus (1818-1892)},
 address={Berlin},
 howpublished={online},
 publisher={C. G. Lüderitz'sche Verlagsbuchhandlung A. Charisius},
 language={ger},
 type={książka},
 title={Ueber die Steinkohlen},
 keywords={Węgiel kamienny},
}