Łopuszyńska, Anna Małgorzata, Bartłomiej Pawlicki, Mateusz Maciej Pawlicki, Karol Lorenc, Magdalena Kozioł, and Zofia Misztal. “Effect of Vitamin D on Treatment of Malignant Tumor”. Journal of Education, Health and Sport 9, no. 8 (August 12, 2019): 758–762. Accessed June 28, 2025. https://apcz.umk.pl/JEHS/article/view/7228.