BIŁOGRAS, Jan, KARAMUS, Kornelia, REJMAK, Rafał, BOROWSKA-ŁYGAN, Martyna, TOMASZEWSKI, Jakub, STRUŻEK, Konrad and URBAN, Wojciech. Effect of vitamin D supplementation. Journal of Education, Health and Sport. Online. 8 December 2024. Vol. 76, p. 56537. [Accessed 19 December 2024]. DOI 10.12775/JEHS.2024.76.56537.