Pahuja, Nikita, Nidhi Chauhan, and Vinita Kalra. “Vitamin D Levels in Pregnant Women in Uttarakhand, India”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 7, no. 1 (December 25, 2017): 169–172. Accessed November 11, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/4171.