K. A., Olabiyi, and Awe O.O. “Children’s Quality and Quantity in Nigeria: A Granger Causality Analysis”. Humaniora 8, no. 3 (July 31, 2017): 211–218. Accessed December 2, 2025. https://journal.binus.ac.id/index.php/humaniora/article/view/4083.