@misc{Bełza_Stanisław_(1849-1929)_Wanda,
 author={Bełza, Stanisław (1849-1929)},
 howpublished={online},
 publisher={Drukarnia K. Pillera},
 language={pol},
 type={książka},
 title={Wanda : opera w 4 aktach},
 keywords={opery, libretta},
}