Ugolo, S.P., and Faith .E. Iwerebor , trans. “Teachers’ Professional Development and Efficiency of Public Primary Schools in Bayelsa State, Nigeria”. International Journal of Education Foundations 2, no. 5 (November 10, 2025): 387–393. Accessed November 5, 2026. https://ijef.esciencepress.net/index.php/journal/article/view/64.