KĘDRA, Kamila, MICHALIK, Izabela, ZARAŃSKA, Julia, AAB, Arkadiusz and BIELAK, Maciej. Impact of COVID-19 outbreak on the mental health in sport and among society. Journal of Education, Health and Sport. Online. 8 August 2023. Vol. 35, no. 1, pp. 125-146. [Accessed 17 July 2024]. DOI 10.12775/JEHS.2023.35.01.010.