Ziółkowska, A., P. Kasperska, E. Oleksy, W. Stemplowski, X. Zukow, and K. Kędziora-Kornatowska. “Assessment of Physical Activity of Residents of Bydgoszcz Using the International Physical Activity Questionnaire IPAQ”. Pedagogy and Psychology of Sport, vol. 6, no. 2, Sept. 2020, pp. 203-11, doi:10.12775/PPS.2020.06.02.020.