Badu, M., S. B. Singh Rajbhandari, and P. Regmi. “Placental Thickness in Third Trimester and Its Correlation to Gestational Age and Fetal Weight in Primigravida”. Journal of Kathmandu Medical College, vol. 8, no. 3, June 2020, pp. 131-5, doi:10.3126/jkmc.v8i3.29717.