TAMPUBOLON, K. .; SIANTURI, C. F. .; HUTABARAT, S. . Pemberian Motivasi dan Pelatihan Operasi Hitung Aritmetika Sosial di Panti Asuhan Gratia Children Medan. ULEAD : Jurnal E-Pengabdian, [S. l.], v. 1, n. 2, p. 94–105, 2022. DOI: 10.54367/ulead.v1i2.1719. Disponível em: https://ejournal.ust.ac.id/index.php/ULEAD/article/view/1719. Acesso em: 21 nov. 2024.