Dahiya, P., S. Jain, N. Gupta, J. sen, and N. Jain. “Comparative Study of Transperineal and Transvaginal Sonography for Localization of Placenta in Antepartum Haermorrhage”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 1, Dec. 2016, pp. 48-52, doi:10.18203/2320-1770.ijrcog20151496.