Parfin, Agnieszka, Krystian Wdowiak, Marzena Furtak-Niczyporuk, and Jolanta Herda. “An Influence of Social Isolation on the Level of Physical Activity As Well As on Well-Being and Mental State of People During the Coronavirus CO VID-19 Pandemic”. Polish Journal of Public Health 129, no. 4 (September 14, 2020): 127–131. Accessed August 31, 2025. https://czasopisma.umlub.pl/pjph/article/view/1108.