Łosień, T., Mędrak, A., Plaskacz, P., Bajerska, I., Reut, M., Dragon, E., … Cebula, A. (2018). Physical activity of children aged 1-4. Journal of Education, Health and Sport, 8(6), 406–411. Retrieved from https://apcz.umk.pl/JEHS/article/view/6076