@misc{Chopin_Fryderyk_(1810-1849)_Trois,
 author={Chopin, Fryderyk (1810-1849)},
 howpublished={online},
 publisher={J. G. Cotta'sche Buchhandlung [i pozostali]},
 type={druk muzyczny},
 title={Trois nocturnes : op. 9 : (B moll, Es dur, H dur) : pour le piano},
 title={Three nocturnes : op. 9 : (Bb minor Eb major, B major) : for the pianoforte},
 keywords={nuty 19 w.},
}