Kozyra, Magdalena, Patryk Zimnicki, Justyna Kaczerska, Natalia Śmiech, Martyna Nowińska, and Joanna Milanowska. “The Effect of Vitamin D on Mental Health – Literature Analysis”. Journal of Education, Health and Sport 10, no. 8 (August 29, 2020): 398–407. Accessed February 8, 2023. https://apcz.umk.pl/JEHS/article/view/JEHS.2020.10.08.048.