Dudzińska, W., O. Chilińska, P. Warias, P. Maskiewicz, E. Maniak, and A. Strońska. “The Role of Vitamin D in the Human Body and the Influence of Vitamin D on the Proliferation of Cancer Cells”. Journal of Education, Health and Sport, vol. 11, no. 5, May 2021, pp. 33-43, doi:10.12775/JEHS.2021.11.05.003.