Yadav, A., P. Yadav, and V. Gupta. “A Rare Case of Spontaneous Heterotopic Pregnancy Presented As Ruptured Ectopic Pregnancy”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 6, Jan. 2017, pp. 2055-7, doi:10.18203/2320-1770.ijrcog20161720.