Rao, A., S. Ghose, and S. Rathod. “Correlation Between Serum Vitamin D Levels and Hypertensive Disorders in Pregnancy in Primigravida in Third Trimester”. Obs Gyne Review: Journal of Obstetric and Gynecology, Vol. 4, no. 2, June 2018, pp. 21-28, doi:10.17511/joog.2018.i02.01.