LELAWARNA, L. Effort Increasing Learning Result Of Communication Operations Calculating Methods Using Napier Bone Students Class Students In Basic Schools 12 Tebat Karai. Jurnal PGSD: Jurnal Ilmiah Pendidikan Guru Sekolah Dasar, [S. l.], v. 11, n. 2, p. 112–119, 2018. DOI: 10.33369/pgsd.11.2.112-119. Disponível em: https://ejournal.unib.ac.id/pgsd/article/view/6240. Acesso em: 4 may. 2024.