FRISNOIRY, Suci; AMANDA, Dea; NATALIA, Destri; BR. SARAGIH, Gita Liana; SIDABUTAR, Priskila. Analisis Efektivitas Sempoa Sebagai Alat Hitung Kuno di Era Modern. Innovative: Journal Of Social Science Research, [S. l.], v. 4, n. 6, p. 5042–5050, 2024. DOI: 10.31004/innovative.v4i6.17083. Disponível em: https://j-innovative.org/index.php/Innovative/article/view/17083. Acesso em: 11 may. 2026.