MROZKOWIAK, Mirosław. An attempt to determine the difference in the impact of loading with the mass of school supplies carried using the left- and right-hand thrust on body posture of 7-year-old pupils of both genders. Pedagogy and Psychology of Sport. Online. 21 September 2020. Vol. 6, no. 3, pp. 44-71. [Accessed 27 April 2024]. DOI 10.12775/PPS.2020.06.03.004.