@misc{Prihonska_Jana_Development_2011,
 author={Prihonska, Jana},
 type={artykuł},
 publisher={Wydawnictwo Akademii im. Jana Długosza w Częstochowie},
 title={Development of combinatorial thinking of elementary school students},
 address={Częstochowa},
 year={2011},
 language={eng},
}