Panggabean A. Pelatihan Musik dan Organ Gereja HKBP di Humbang Habinsaran Siborong-Borong . J-I-P-M-A-S [Internet]. 2020Aug.30 [cited 2024Apr.29];1(1):13-28. Available from: https://ejournal.uhn.ac.id/index.php/pengabdian/article/view/75