SINTAYEHU, B. The Power Sources and Influences of Secondary School Principals in Eastern Ethiopia. International Journal of Learning, Teaching and Educational Research, [S. l.], v. 19, n. 10, p. 115–133, 2020. Disponível em: https://ijlter.net/index.php/ijlter/article/view/224. Acesso em: 16 jun. 2026.