@misc{Florkova_Marcela_Gaining_2007,
 author={Florkova, Marcela},
 type={artykuł},
 publisher={Wydawnictwo Akademii im. Jana Długosza w Częstochowie},
 title={Gaining mathematical skills by using 'concrete' manipulatives},
 address={Częstochowa},
 year={2007},
 language={eng},
}