Gupta, S., K. Jain, and J. Kaur. “Vitamin D Deficiency in Pregnancy and Its Effects on Neonatal Outcome”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 7, no. 11, Oct. 2018, pp. 4481-4, doi:10.18203/2320-1770.ijrcog20184493.