WIDAWSKA-STANISZ, Agnieszka. Environmentally friendly activities in sports and leisure services as an expression of the corporate social responsibility. Journal of Education, Health and Sport. Online. 23 May 2022. Vol. 12, no. 5, pp. 243-251. [Accessed 24 February 2026]. DOI 10.12775/JEHS.2022.12.05.018.