Rywczyńska, A. i Jaroszewski, P. 2019. Influence of the Use of Digital Technologies on the Physical Activity of Children Aged 7–17 Years in the Opinion of Parents. Journal of Education, Technology and Computer Science. 27, 1 (mar. 2019), 164–171. DOI:https://doi.org/10.15584/eti.2019.1.21.