@misc{Giruć_Piotr_Sylwester_Derivative,
 author={Giruć, Piotr Sylwester},
 howpublished={online},
 publisher={Wydaw. UMCS},
 language={eng},
 type={artykuł},
 title={Derivative Instruments Dedicated for Agricultural Commodity Entities in Poland},
 keywords={ekonomia},
}