@misc{Sanz-Martin_Daniel_Contribution_2021,
 author={Sanz-Martin, Daniel and Ruiz-Tendero, Germán and Fernández-García, Emilia},
 type={artykuł},
 publisher={Projack},
 title={Contribution of physical education classes to daily physical activity levels of adolescents},
 address={Częstochowa},
 year={2021},
 language={eng},
}