Arifin, Nurdin, Asmita Yati, and Fauziah Fauziah. 2020. “Pembinaan OSN Matematika Dan IPA Bagi Peserta Didik SD Negeri 002 Samarinda Utara”. Jurnal Abdimas Mahakam 4 (02):188-96. https://doi.org/10.24903/jam.v4i02.918.