Silaban PJ, Tarihoran A, Manullang N, Surbakti R. Sosialisasi Alat Peraga Satuan Panjang di UPT SD Free Methodist 2 Medan Helvetia. Jurnal Pengabdian Masyarakat Bangsa [Internet]. 2024 Jan. 7 [cited 2026 Jul. 3];1(11):2765-8. Available from: https://jurnalpengabdianmasyarakatbangsa.com/index.php/jpmba/article/view/145