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SITI ROHANI, NPM 2106100026 (2025) THE ROLE OF THE PRINCIPAL AS A SUPERVISOR IN INCREASING THE EFFECTIVENESS OF ADMINISTRATIVE SERVICE AT SMP NEGERI 1 BILAH HULU. Tugas_Akhir (Artikel) Jurnal Riset Ilmu Pendidikan, 4 (4). pp. 70-78. ISSN 2808-750X (e-ISSN)