Chatterjee, S., K. Yadav, P. Prakash, and K. Shekhawat. “Foetal Kidney Length As a Parameter for Determination of Gestational Age in Pregnancy by Ultrasonography”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 6, Jan. 2017, pp. 1949-52, doi:10.18203/2320-1770.ijrcog20161696.