SIBURIAN, P.; PASARIBU, A.; MANULLANG, J. Model Development of Managerial Supervision for the Elementary School Principal in Medan Indonesia. International Journal of Sciences: Basic and Applied Research (IJSBAR), [S. l.], v. 30, n. 4, p. 1–10, 2016. Disponível em: https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/6488. Acesso em: 10 may. 2024.