@misc{Chopin_Fryderyk_(1810-1849)_Nocturnes,
 author={Chopin, Fryderyk (1810-1849)},
 howpublished={online},
 publisher={Breitkopf & Härtel},
 language={ger},
 language={fre},
 language={eng},
 type={druk muzyczny},
 title={Nocturnes},
 keywords={nuty 20 w.},
}