Owonikoko, Kola M. “Determinants of Inter-Pregnancy Interval in Ogbomoso: An Unmet Need for Contraceptive Usage”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 4, no. 2 (February 6, 2017): 316–321. Accessed October 3, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/1873.