OLOWO G. M. ASSURING EDUCATIONAL QUALITY: SUPERVISORY APPROACHES IN PUBLIC SECONDARY SCHOOLS OF OYO STATE, NIGERIA. African Journal of Educational Management, [S. l.], v. 17, n. 03, p. 135–146, 2021. Disponível em: https://journals.ibadanedu.com/index.php/ajem/article/view/334. Acesso em: 25 mar. 2026.