Reddy, S., and M. Padma. “Comparative Study of Tubal Patency by Sonosalpingogram Hysterosalpingography and Diagnostic Laparoscopy”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 8, no. 9, Aug. 2019, pp. 3435-41, doi:10.18203/2320-1770.ijrcog20193768.