Ezechi, O., B. Kalu, O. Loto, P. Ezeobi, and C. Nwokoro. “Obstetric Performance in Elderly Nigerian Women: A Comparative Study”. Nepal Journal of Obstetrics and Gynaecology, vol. 2, no. 1, Nov. 2008, pp. 9-12, https://nepjol.info./index.php/NJOG/article/view/1468.