Thamer, Rasha, and Hamed Al-Sadoun. “The Role of Vitamin D3 in Skin Pigments”. International Journal of Psychosocial Rehabilitation 24, no. 3 (May 31, 2020): 217–224. Accessed June 11, 2025. https://www.psychosocial.com/index.php/ijpr/article/view/3124.