DOMAŃSKI, Jarosław, STEFANIAK, Tadeusz, WESOŁOWSKI, Daniel, MAUER-RÓŻAŃSKA, Renata and MARDAUSZ, Anna. The role of social media in promoting the activities of the personal trainer. Journal of Education, Health and Sport. Online. 25 April 2022. Vol. 12, no. 5, pp. 140-166. [Accessed 24 January 2025]. DOI 10.12775/JEHS.2022.12.05.010.