Pandey, D., T. Nagar, S. Sharma, and S. Salhan. “A Rare Case of Fourth Consecutive Fallopian Tube Ectopic Pregnancy”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 4, no. 2, Feb. 2017, pp. 490-2, https://www.ijrcog.org/index.php/ijrcog/article/view/1928.