“Variation in Educational Attainment Levels: Statistical Evidence from The Nigeria Demographic Health Surveys (2008, 2013 and 2018)”. International Journal of Development Mathematics (IJDM) 1, no. 2 (June 2, 2024): 191–199. Accessed August 27, 2026. https://ijdm.org.ng/index.php/Journals/article/view/64.