PIEKARSKA, Ewa, PAWLICKI, Mateusz, ŁOPUSZYŃSKA, Anna, KOZIOŁ, Magdalena, KRASA, Aleksandra and PIECEWICZ-SZCZĘSNA, Halina. Association Between Male fertility and Vitamin D. Journal of Education, Health and Sport. Online. 26 August 2021. Vol. 11, no. 8, pp. 322-327. [Accessed 17 July 2024]. DOI 10.12775/JEHS.2021.11.08.035.