SIBURIAN, Paningkat; PASARIBU, Asahan; MANULLANG, Jongga. Model Development of Managerial Supervision for the Elementary School Principal in Medan Indonesia. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 30, n. 4, p. 1–10, 2016. Disponível em: https://gssrr.org/JournalOfBasicAndApplied/article/view/6488. Acesso em: 17 sep. 2025.