ANALISIS EFEKTIVITAS SUPERVISI AKADEMIK KEPALA SEKOLAH DALAM PROSES PEMBELAJARAN DI SMP NEGERI 3 LINTONGNIHUTA KABUPATEN HUMBANG HASUNDUTAN. JOURNAL OF SCIENCE AND SOCIAL RESEARCH, [S. l.], v. 9, n. 2, p. 2229–2243, 2026. DOI: 10.54314/jssr.v9i2.6165. Disponível em: https://jurnal.goretanpena.com/index.php/JSSR/article/view/6165.. Acesso em: 24 aug. 2026.