Oparaji, Isreal Chijiuka, Martha-Rose Ifeoma Uwaezuoke, and Eucharia Chinenye Okonkwo. “The Elements in System Analysis on principals’ Managerial Effectiveness in Public Secondary School”. Eureka: Journal of Educational Research 3, no. 1 (May 27, 2024): 36–43. Accessed November 20, 2025. https://eureka.id-sre.org/index.php/ejer/article/view/32.