SZARK-ECKARDT, Mirosława, KOWALCZYK, Łukasz, ŻUKOWSKA, Hanna and ŁUBKOWSKA, Wioletta. Doping and supplementation applied in Bydgoszcz gyms. Quality in Sport. Online. 30 June 2015. Vol. 1, no. 2, pp. 26-42. [Accessed 2 July 2025]. DOI 10.12775/QS.2015.009.