@misc{Welfe_Aleksander_(1960-_)._Ekonometria,
 author={Welfe, Aleksander (1960- ).},
 howpublished={online},
 publisher={Polskie Wydawnictwo Ekonomiczne},
 language={pol},
 title={Ekonometria},
 type={Książka},
 keywords={Ekonometria., Econometrics.},
}