MANURUNG, Mardurum; PURBA, Sukarman; SIAHAAN, Mian. Improving Teaching Skills Throug Teachers by the Clinical Supervision of non-directive Approach with Individual Techniques in Smkn 1 Sidikalang District Dairi. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 34, n. 3, p. 175–181, 2017. Disponível em: https://gssrr.org/JournalOfBasicAndApplied/article/view/7708. Acesso em: 4 oct. 2025.