Manurung M, Purba S, Siahaan M. Improving Teaching Skills Throug Teachers by the Clinical Supervision of non-directive Approach with Individual Techniques in Smkn 1 Sidikalang District Dairi. IJSBAR [Internet]. 2017 Jul. 19 [cited 2025 Sep. 10];34(3):175-81. Available from: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/7708