@misc{Gajdka_Jerzy._Changes,
 author={Gajdka, Jerzy. and Szymański, Marek (zarządzanie).},
 howpublished={online},
 publisher={Wydawnictwo UMCS},
 language={eng},
 type={artykuł},
 title={Changes in the capital structure of Polish companies during the last twenty years (1997–2017)},
 keywords={ekonomia},
}