The Role of School Principals in Improving Students2019; Academic Performance in Secondary Schools of Sidama Zone, SNNPR. Global Journal of Management and Business Research, [S. l.], v. 19, n. G2, p. 59–69, 2019. Disponível em: https://testing.journalofbusiness.org/index.php/GJMBR/article/view/102563. Acesso em: 4 feb. 2026.