MANURUNG, B.; SIBUEA, N. . Perubahan model kebijakan pelayanan kepala sekolah di SMA Negeri 20 Medan di era COVID-19. Indonesian Journal of Educational Development (IJED), [S. l.], v. 2, n. 1, p. 10–18, 2021. DOI: 10.5281/zenodo.4781837. Disponível em: https://ojs.mahadewa.ac.id/index.php/ijed/article/view/1152. Acesso em: 14 aug. 2025.