Jusiak, Justyna, Paulina Halik, Daniel Załęski, Michał Krankiewicz, and Martyna Berdzińska. “Vitamin D: Role, Sources, Mechanism of Action and Significance for Human Health”. Quality in Sport 47 (November 26, 2025): 66791. Accessed December 11, 2025. https://apcz.umk.pl/QS/article/view/66791.